{"id":7552,"date":"2026-04-03T14:26:39","date_gmt":"2026-04-03T14:26:39","guid":{"rendered":"https:\/\/telyrx.com\/blog\/?p=7552"},"modified":"2026-04-07T18:43:31","modified_gmt":"2026-04-07T18:43:31","slug":"what-is-freestyle-libre-2-sensor","status":"publish","type":"post","link":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/","title":{"rendered":"What Is the FreeStyle Libre 2 CGM Sensor?"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-how-it-works\">How It Works<\/h2>\n\n\n\n<p>The FreeStyle Libre 2 system works through two main components: the sensor and the reader (or app) that provides the glucose readings.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sensor:<\/strong> A small sensor is applied just under the skin on the back of the upper arm. This sensor measures glucose levels every minute throughout the day. It is designed to be worn continuously for up to 14 days.<\/li>\n\n\n\n<li><strong>Reader and app:<\/strong> People using the FreeStyle Libre 2 system can see their glucose readings by using the included handheld reader or downloading the free smartphone app. The system sends real-time data directly to your smartphone or reader, and can be configured for alerts.<\/li>\n<\/ul>\n\n\n\n<div class=\"quick-facts-card\">\n  <table class=\"quick-facts-table\">\n    <colgroup>\n      <col\/>\n      <col\/>\n    <\/colgroup>\n\n    <thead>\n      <tr>\n        <th colspan=\"2\">Quick Facts<\/th>\n      <\/tr>\n    <\/thead>\n\n    <tbody>\n      <tr>\n        <td><strong>Common Brands<\/strong><\/td>\n        <td>FreeStyle Libre 2 System<\/td>\n      <\/tr>\n\n      <tr>\n         <td><strong>Drug Class<\/strong><\/td>\n        <td>Continuous glucose monitor (CGM)<\/td>\n      <\/tr>\n\n      <tr>\n        <td><strong>Generic Status<\/strong><\/td>\n        <td>Generic is not available<\/td>\n      <\/tr>\n\n      <tr>\n         <td><strong>Availability<\/strong><\/td>\n        <td>Prescription only<\/td>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-dosing\">Dosing<\/h2>\n\n\n\n<p>As a continuous glucose monitor, the FreeStyle Libre 2 does not have \u201cdoses\u201d in the traditional sense. The sensor is designed to be worn for 14 days. The sensor pack will come with instructions that explain how to apply and remove it, but this is a general overview:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wash your hands and the application site. <\/strong>Before applying the sensor, wash and dry your hands and the skin of the application site with plain soap and water. Clean the area with an alcohol wipe and allow it to air dry.&nbsp;<\/li>\n\n\n\n<li><strong>Apply the sensor to the back of your upper arm. <\/strong>Remove the sensor from the package and push it firmly onto your skin. Gently pull the applicator away.<\/li>\n\n\n\n<li><strong>Wait 1 hour.<\/strong> After an hour, the FreeStyle Libre 2 system will start providing glucose readings. Follow the instructions in the app to scan the new sensor. For the physical reader, turn it on and select \u201cstart new sensor.\u201d Hold it within 1.5 inches of the sensor to scan it and begin receiving readings.<\/li>\n\n\n\n<li><strong>Replace the sensor after 14 days (or sooner if it becomes loose). <\/strong>Slowly pull up on the edge of the sensor\u2019s adhesive to remove it.<\/li>\n<\/ul>\n\n\n\n<p><em><strong>Note:<\/strong> Dosing information below is educational only. Your prescribing physician will determine your specific dose based on your individual health needs.&nbsp;Always follow your healthcare provider\u2019s instructions for exact dosing.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-uses\">Uses<\/h2>\n\n\n\n<p><strong>FDA-Approved Uses<\/strong><\/p>\n\n\n\n<p>The FreeStyle Libre 2 CGM sensor is FDA-approved to manage type 1 and type 2 diabetes.<\/p>\n\n\n\n<p><strong>Off-Label Uses<\/strong><\/p>\n\n\n\n<p>You may see the FreeStyle Libre 2 CGM sensor prescribed for uses that are not &#8220;FDA-approved.&#8221; This is a common and legal practice called &#8220;off-label&#8221; prescribing, where a doctor uses their clinical judgment to prescribe a drug for a different (but well-researched) purpose.&nbsp;<\/p>\n\n\n\n<p>There are currently no common off-label uses for the FreeStyle Libre 2 CGM sensor.<\/p>\n\n\n<div class=\"telyrx-email-cta alignfull wp-block-telyrx-email-signup\">\n\t<h2 class=\"telyrx-email-cta__heading\" data-toc-hidden=\"true\">Get Savings Updates<\/h2>\n\t<p class=\"telyrx-email-cta__description\">Join our mailing list for exclusive deals and more.<\/p>\n\t\t\t<form\n\t\t\tid=\"telyrx-email-form-1\"\n\t\t\tclass=\"telyrx-email-cta__form\"\n\t\t\tdata-portal-id=\"46401311\"\n\t\t\tdata-form-id=\"14e1d7d5-6b17-4228-b42e-c06d1a6c240b\"\n\t\t\tdata-i18n=\"{&quot;subscribe&quot;:&quot;Subscribe&quot;,&quot;success&quot;:&quot;Thanks! You&#039;re subscribed.&quot;,&quot;error&quot;:&quot;Something went wrong. Please try again.&quot;}\"\n\t\t>\n\t\t\t<div class=\"telyrx-email-cta__pill\">\n\t\t\t\t<input\n\t\t\t\t\ttype=\"email\"\n\t\t\t\t\tname=\"email\"\n\t\t\t\t\tclass=\"telyrx-email-cta__input\"\n\t\t\t\t\tplaceholder=\"Enter your email\"\n\t\t\t\t\trequired\n\t\t\t\t\tautocomplete=\"email\"\n\t\t\t\t\/>\n\t\t\t\t<button type=\"submit\" class=\"telyrx-email-cta__button\">\n\t\t\t\t\tSubscribe\t\t\t\t<\/button>\n\t\t\t<\/div>\n\t\t\t<p class=\"telyrx-email-cta__status\" aria-live=\"polite\"><\/p>\n\t\t<\/form>\n\t\t<noscript>\n\t\t\t<p class=\"telyrx-email-cta__noscript\">Please enable JavaScript to use the signup form.<\/p>\n\t\t<\/noscript>\n\t<\/div>\n\n\n\n<section class=\"telyrx-side-effects\" data-toc-title=\"Side Effects\">\n\t<h2 class=\"telyrx-side-effects__heading\">Side Effects<\/h2>\n\t<hr class=\"telyrx-side-effects__separator\">\n\t<div class=\"telyrx-side-effects__content\">\n\t\t\n\n<p>The most common side effect with the FreeStyle Libre 2 CGM sensor is mild skin irritation at the application site. The FreeStyle Libre 2 sensor generally doesn\u2019t cause serious side effects, but there are some possible risks to be aware of.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-common-side-effects\">Common Side Effects<\/h3>\n\n\n\n<div class=\"telyrx-side-effects-chip telyrx-side-effects-chip--common\">\n\t\n\n<ul class=\"wp-block-list\">\n<li>Mild skin irritation at the application site<\/li>\n\n\n\n<li>Mild discomfort at the application site<\/li>\n<\/ul>\n\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-serious-side-effects\">Serious Side Effects<\/h3>\n\n\n\n<div class=\"telyrx-side-effects-chip telyrx-side-effects-chip--serious\">\n\t\n\n<p>Serious side effects are rare, but it&#8217;s important to know what to look for if they do occur. Stop using the FreeStyle Libre 2 CGM sensor and call your doctor immediately if you experience:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inaccurate readings due to vitamin C:<\/strong> Taking more than 500 mg of vitamin C (ascorbic acid) supplements while wearing the FreeStyle Libre 2 CGM sensor can cause falsely high glucose readings. This is dangerous because it may mask low blood sugar levels (hypoglycemia).<\/li>\n\n\n\n<li><strong>Low or high blood sugar:<\/strong> There is a possibility that the sensor readings do not match your physical symptoms. If you feel like you\u2019re experiencing low or high blood sugar but the FreeStyle Libre 2 reading doesn\u2019t reflect that, perform a fingerstick test to be sure.<\/li>\n\n\n\n<li><strong>Skin reactions:<\/strong> If you experience significant redness, swelling, or irritation around the sensor, it may be necessary to remove it.<\/li>\n<\/ul>\n\n<\/div>\n\n\n\n<p class=\"has-muted-color has-text-color\" style=\"font-size:0.875rem\"><em>Call your doctor immediately if you experience any concerning or prolonged symptoms.<\/em><\/p>\n\n\t<\/div>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pharmacist-tips\">Pharmacist Tips<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-new-sensors-have-a-1-hour-warmup-period\">New Sensors Have a 1-Hour \u201cWarmup\u201d Period<\/h3>\n\n\n\n<p>When you first apply a new sensor, you\u2019ll need to wait 60 minutes (1 hour) after application before you can check your glucose readings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-rotate-through-application-sites\">Rotate Through Application Sites<\/h3>\n\n\n\n<p>The Libre 2 sensor is approved for placement on the back of the upper arm. When it\u2019s time to switch sensors (every 14 days), choose a different spot on the back of your arm to avoid skin irritation and discomfort.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-prepare-your-skin-before-applying\">Prepare Your Skin Before Applying<\/h3>\n\n\n\n<p>Wash and dry your hands thoroughly. Wipe the chosen area on your arm with an alcohol wipe and let it dry.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-store-at-room-temperature\">Store at Room Temperature<\/h3>\n\n\n\n<p>To function properly, the sensors should be stored at temperatures between 36\u00b0F and 82\u00b0F.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-remove-the-sensor-before-medical-imaging\">Remove the Sensor Before Medical Imaging<\/h3>\n\n\n\n<p>MRIs, CT scans, and high-frequency electrical heat (diathermy) treatments can damage the sensor and lead to incorrect readings. If you are scheduled for one of these tests, tell your provider beforehand that you\u2019re using the FreeStyle Libre 2 system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-do-not-reuse-sensors\">Do Not Reuse Sensors<\/h3>\n\n\n\n<p>Reusing sensors or sharing them with others increases the risk of infection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-avoid-body-scanners-and-x-ray-machines\">Avoid Body Scanners and X-Ray Machines<\/h3>\n\n\n\n<p>Do not take the FreeStyle Libre 2 CGM sensor through full-body scanners or put it through x-ray machines at the airport. It\u2019s unknown if they could affect the sensor. Instead, ask security personnel for a hand-wand check, visual inspection, or walk-through metal detector.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-safely-dispose-of-used-sensors-and-applicators\">Safely Dispose of Used Sensors and Applicators<\/h3>\n\n\n\n<p>The applicator contains a needle mechanism. Screw the used applicator and lid back together and dispose of them in an appropriate medical sharps container or biohazard bag. The sensor itself can be thrown away as electrical waste.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-drug-interactions\">Drug Interactions<\/h2>\n\n\n\n<p>Certain medications and substances can interact with the FreeStyle Libre 2 CGM sensor, potentially affecting its ability to provide accurate glucose readings. For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Vitamin C (ascorbic acid):<\/strong> Taking more than 500 mg of vitamin C per day can affect the sensor\u2019s accuracy, causing it to display glucose readings that are higher than they actually are. Verify the content of multivitamins, cold remedies, and other supplements to see how much vitamin C they contain before using them with this system. If you\u2019re not sure if something is safe to take with the Libre 2, ask your doctor.<\/li>\n<\/ul>\n\n\n\n<p>Always give your doctor and pharmacist a complete list of all your medications, vitamins, and supplements to check for potential interactions.<\/p>\n\n\n\n<section class=\"telyrx-faq-section\" data-toc-title=\"FAQs\">\n\t<h2 class=\"telyrx-faq-heading\">FAQs<\/h2>\n\t\t<div class=\"telyrx-faq-items\">\n\t\t\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Do I still need to scan the sensor if it has Bluetooth alarms?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>While the FreeStyle Libre 2 sends real-time glucose readings and alerts to your smartphone, you still need to scan at least every 8 hours to see a 24-hour glycemic snapshot.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Why does my sensor reading not match my fingerstick number?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>The sensor measures glucose in the interstitial fluid (fluid just below the skin), not directly in the blood like a fingerstick. There is a physiological lag between blood sugar and interstitial fluid sugar. If your symptoms do not match the reading, or if you suspect the reading is inaccurate, it\u2019s recommended to verify with a fingerstick test.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Can I wear the sensor during an MRI or CT scan?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>No. It is advised to remove the FreeStyle Libre 2 sensor before undergoing an MRI, CT scan, or diathermy treatment. These tests can damage the sensor and lead to incorrect glucose data.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Why do I get a &#8220;Signal Loss&#8221; alarm when my phone is right next to me?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>For the alarms to function, your phone or reader must be within 20 feet of you at all times. If you are using a smartphone, your Bluetooth setting must be turned on. If Bluetooth is off or the device is out of range, the signal will be lost.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Is the FreeStyle Libre 2 waterproof enough for swimming or hot tubs?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>The FreeStyle Libre 2 sensor is water-resistant, but not waterproof. It\u2019s generally safe for showering, swimming, and hot tubs as long as you spend less than 30 minutes in the water and don\u2019t submerge it deeper than 3 feet.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Can I put the sensor on my stomach or thigh instead of my arm?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>No. The FreeStyle Libre 2 sensor is only designed to work when placed on the back of the upper arm.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Why does the sensor fall off before the 14 days are up?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>If the sensor becomes loose, do not try to reattach it. It\u2019s recommended to remove it and apply a new one. To prevent adhesion issues in the future, ensure your skin is clean, dry, and prepped with an alcohol wipe before applying the sensor.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Does this sensor work with an insulin pump?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>No, the FreeStyle Libre 2 sensor does not work with an insulin pump. However, the Libre 3 and Libre 2 Plus sensors can be compatible with an insulin pump.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Can I use my phone and the reader device at the same time?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Yes, you can use either the handheld reader or the smartphone app.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Is FreeStyle Libre 2 approved for gestational diabetes?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>No. The FreeStyle Libre 2 CGM system is not approved for use on pregnant people. Let your provider know if you are currently pregnant or planning to become pregnant.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">How do I turn off the loud alarms at night?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>You can turn on \u201cSilent Mode\u201d in the app to turn off alarms for up to 6 hours.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Why does the sensor say &#8220;LO&#8221; instead of a number?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>This indicates that the glucose level is below 20 mg\/dL. Check your glucose levels with a fingerstick test.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Can I take Tylenol (acetaminophen) or vitamin C while wearing this?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Taking more than 500 mg of vitamin C can cause falsely high readings. It\u2019s best to limit your vitamin C intake while using the FreeStyle Libre 2 system. Tylenol (acetaminophen) is not contraindicated, but it\u2019s best to check with your doctor in case it interacts with other medications you\u2019re taking.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">What should I do if the sensor bleeds when I apply it?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Minor bleeding may happen. If the sensor is not secure or there is significant bleeding or swelling, remove the sensor and contact your healthcare provider.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">How long is the warmup period before I get my first reading?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>The warmup period lasts 1 hour. You can view glucose readings 60 minutes after applying a new sensor.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Can I go through airport security (body scanners) with the sensor on?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Generally, no. You should not take the Libre 2 sensor through body scanners or X-ray machines. Request a manual inspection or use a walk-through metal detector instead.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">How do I safely dispose of the applicator needle?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>The applicator contains a needle. Screw the lid back onto the used applicator and dispose of it in an appropriate sharps container or a yellow biohazard bag.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">What is the difference between the Libre 2 and the Libre 3?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Both are used to monitor glucose levels. The FreeStyle Libre 3 is newer than the Libre 2. While both systems track glucose, they are distinct product generations with different hardware specifications.<\/p>\n\n\t<\/div>\n<\/details>\n\n\t<\/div>\n<\/section>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Do I still need to scan the sensor if it has Bluetooth alarms?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"While the FreeStyle Libre 2 sends real-time glucose readings and alerts to your smartphone, you still need to scan at least every 8 hours to see a 24-hour glycemic snapshot.\"}},{\"@type\":\"Question\",\"name\":\"Why does my sensor reading not match my fingerstick number?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The sensor measures glucose in the interstitial fluid (fluid just below the skin), not directly in the blood like a fingerstick. There is a physiological lag between blood sugar and interstitial fluid sugar. If your symptoms do not match the reading, or if you suspect the reading is inaccurate, it\u2019s recommended to verify with a fingerstick test.\"}},{\"@type\":\"Question\",\"name\":\"Can I wear the sensor during an MRI or CT scan?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It is advised to remove the FreeStyle Libre 2 sensor before undergoing an MRI, CT scan, or diathermy treatment. These tests can damage the sensor and lead to incorrect glucose data.\"}},{\"@type\":\"Question\",\"name\":\"Why do I get a \\\"Signal Loss\\\" alarm when my phone is right next to me?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For the alarms to function, your phone or reader must be within 20 feet of you at all times. If you are using a smartphone, your Bluetooth setting must be turned on. If Bluetooth is off or the device is out of range, the signal will be lost.\"}},{\"@type\":\"Question\",\"name\":\"Is the FreeStyle Libre 2 waterproof enough for swimming or hot tubs?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The FreeStyle Libre 2 sensor is water-resistant, but not waterproof. It\u2019s generally safe for showering, swimming, and hot tubs as long as you spend less than 30 minutes in the water and don\u2019t submerge it deeper than 3 feet.\"}},{\"@type\":\"Question\",\"name\":\"Can I put the sensor on my stomach or thigh instead of my arm?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The FreeStyle Libre 2 sensor is only designed to work when placed on the back of the upper arm.\"}},{\"@type\":\"Question\",\"name\":\"Why does the sensor fall off before the 14 days are up?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If the sensor becomes loose, do not try to reattach it. It\u2019s recommended to remove it and apply a new one. To prevent adhesion issues in the future, ensure your skin is clean, dry, and prepped with an alcohol wipe before applying the sensor.\"}},{\"@type\":\"Question\",\"name\":\"Does this sensor work with an insulin pump?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, the FreeStyle Libre 2 sensor does not work with an insulin pump. However, the Libre 3 and Libre 2 Plus sensors can be compatible with an insulin pump.\"}},{\"@type\":\"Question\",\"name\":\"Can I use my phone and the reader device at the same time?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, you can use either the handheld reader or the smartphone app.\"}},{\"@type\":\"Question\",\"name\":\"Is FreeStyle Libre 2 approved for gestational diabetes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The FreeStyle Libre 2 CGM system is not approved for use on pregnant people. Let your provider know if you are currently pregnant or planning to become pregnant.\"}},{\"@type\":\"Question\",\"name\":\"How do I turn off the loud alarms at night?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"You can turn on \u201cSilent Mode\u201d in the app to turn off alarms for up to 6 hours.\"}},{\"@type\":\"Question\",\"name\":\"Why does the sensor say \\\"LO\\\" instead of a number?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This indicates that the glucose level is below 20 mg\/dL. Check your glucose levels with a fingerstick test.\"}},{\"@type\":\"Question\",\"name\":\"Can I take Tylenol (acetaminophen) or vitamin C while wearing this?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Taking more than 500 mg of vitamin C can cause falsely high readings. It\u2019s best to limit your vitamin C intake while using the FreeStyle Libre 2 system. Tylenol (acetaminophen) is not contraindicated, but it\u2019s best to check with your doctor in case it interacts with other medications you\u2019re taking.\"}},{\"@type\":\"Question\",\"name\":\"What should I do if the sensor bleeds when I apply it?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Minor bleeding may happen. If the sensor is not secure or there is significant bleeding or swelling, remove the sensor and contact your healthcare provider.\"}},{\"@type\":\"Question\",\"name\":\"How long is the warmup period before I get my first reading?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The warmup period lasts 1 hour. You can view glucose readings 60 minutes after applying a new sensor.\"}},{\"@type\":\"Question\",\"name\":\"Can I go through airport security (body scanners) with the sensor on?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Generally, no. You should not take the Libre 2 sensor through body scanners or X-ray machines. Request a manual inspection or use a walk-through metal detector instead.\"}},{\"@type\":\"Question\",\"name\":\"How do I safely dispose of the applicator needle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The applicator contains a needle. Screw the lid back onto the used applicator and dispose of it in an appropriate sharps container or a yellow biohazard bag.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between the Libre 2 and the Libre 3?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Both are used to monitor glucose levels. The FreeStyle Libre 3 is newer than the Libre 2. While both systems track glucose, they are distinct product generations with different hardware specifications.\"}}]}<\/script>\n\n<div class=\"telyrx-comparable-medications wp-block-telyrx-comparable-medications\">\n\t<h2 class=\"telyrx-comparable-medications__title\">Comparable Medications<\/h2>\n\t\t\t<div class=\"telyrx-comparable-medications__intro\">\n\n<p><strong><strong><strong>FreeStyle Libre 2 CGM Sensor, FreeStyle Libre 3, FreeStyle Libre 2 Plus, Dexcom G7, or Eversense E3?<\/strong><\/strong><\/strong><\/p>\n\n\n\n<p>There are several medications that your doctor can prescribe in place of the FreeStyle Libre 2 CGM sensor. Here are a few possible alternatives below.<\/p>\n\n<\/div>\n\t\t\t\t<div class=\"telyrx-comparable-medications__item\">\n\t\t\t<div class=\"telyrx-comparable-medications__item-top\">\n\t\t\t\t<div class=\"telyrx-comparable-medications__item-info\">\n\t\t\t\t\t<h3 class=\"telyrx-comparable-medications__name\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__name-link\" href=\"https:\/\/telyrx.com\/medications\/freestyle-libre-3\">\n\t\t\t\t\t\t\t\tFreeStyle Libre 3 CGM Sensor\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__price\">\n\t\t\t\t\t\t\tFrom $119.99\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__cta\" href=\"https:\/\/telyrx.com\/medications\/freestyle-libre-3\">\n\t\t\t\t\t\tView Product\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__description\">\n\t\t\t\t\tAnother model of the Libre CGM that\u2019s smaller and newer than the Libre 2.\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<hr class=\"telyrx-comparable-medications__divider\">\n\t\t\t\t\t<div class=\"telyrx-comparable-medications__item\">\n\t\t\t<div class=\"telyrx-comparable-medications__item-top\">\n\t\t\t\t<div class=\"telyrx-comparable-medications__item-info\">\n\t\t\t\t\t<h3 class=\"telyrx-comparable-medications__name\">\n\t\t\t\t\t\t\t\t\t\t\t\t\tFreeStyle Libre 2 Plus\t\t\t\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__description\">\n\t\t\t\t\tA newer version of the Libre CGM that lasts up to 15 days and is compatible with insulin pumps.\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<hr class=\"telyrx-comparable-medications__divider\">\n\t\t\t\t\t<div class=\"telyrx-comparable-medications__item\">\n\t\t\t<div class=\"telyrx-comparable-medications__item-top\">\n\t\t\t\t<div class=\"telyrx-comparable-medications__item-info\">\n\t\t\t\t\t<h3 class=\"telyrx-comparable-medications__name\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__name-link\" href=\"https:\/\/telyrx.com\/medications\/dexcom-g7-sensor\">\n\t\t\t\t\t\t\t\tDexcom G7 Sensor\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__price\">\n\t\t\t\t\t\t\tFrom $159.99\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__cta\" href=\"https:\/\/telyrx.com\/medications\/dexcom-g7-sensor\">\n\t\t\t\t\t\tView Product\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__description\">\n\t\t\t\t\tA CGM used to monitor blood sugar levels that takes readings every 5 minutes and can be worn for up to 10 days.\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<hr class=\"telyrx-comparable-medications__divider\">\n\t\t\t\t\t<div class=\"telyrx-comparable-medications__item\">\n\t\t\t<div class=\"telyrx-comparable-medications__item-top\">\n\t\t\t\t<div class=\"telyrx-comparable-medications__item-info\">\n\t\t\t\t\t<h3 class=\"telyrx-comparable-medications__name\">\n\t\t\t\t\t\t\t\t\t\t\t\t\tEversense E3\t\t\t\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__description\">\n\t\t\t\t\tA long-term CGM that is worn for up to 180 days (6 months).\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\n\t\t\t<\/div>\n\n\n<div class=\"telyrx-product-list telyrx-product-list--single wp-block-telyrx-product-list\">\n\t\t\t\t\t<a class=\"telyrx-product-list__card telyrx-product-list__card--single\" href=\"https:\/\/telyrx.com\/medications\/freestyle-libre-2-sensor\">\n\t\t\t\t\t\t\t<img\n\t\t\t\t\tclass=\"telyrx-product-list__image\"\n\t\t\t\t\tsrc=\"https:\/\/telyrx.com\/media\/catalog\/product\/f\/r\/freestylelibre2432_1.png\"\n\t\t\t\t\talt=\"FreeStyle Libre 2 CGM Sensor\"\n\t\t\t\t\twidth=\"213\"\n\t\t\t\t\theight=\"213\"\n\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t>\n\t\t\t\t\t\t<div class=\"telyrx-product-list__content\">\n\t\t\t\t<p class=\"telyrx-product-list__name\">FreeStyle Libre 2 CGM Sensor<\/p>\n\t\t\t\t<span class=\"telyrx-product-list__cta telyrx-product-list__cta--yellow\">\n\t\t\t\t\tView Product\t\t\t\t<\/span>\n\t\t\t<\/div>\n\t\t<\/a>\n\t<\/div>\n\n\n<div class=\"telyrx-product-list-section alignfull wp-block-telyrx-product-list\">\n\t<h2 class=\"telyrx-product-list-section__heading\" data-toc-hidden=\"true\">We Have the FreeStyle Libre 2 CGM Sensor in Stock. Get Yours Today!<\/h2>\n\t<div class=\"telyrx-product-list telyrx-product-list--footer-multi\">\n\t\t<div class=\"telyrx-product-list__grid\">\n\t\t\t\t\t\t\t<a class=\"telyrx-product-list__card\" href=\"https:\/\/telyrx.com\/medications\/freestyle-libre-2-sensor\">\n\t\t\t\t\t\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tclass=\"telyrx-product-list__image\"\n\t\t\t\t\t\t\tsrc=\"https:\/\/telyrx.com\/media\/catalog\/product\/f\/r\/freestylelibre2432_1.png\"\n\t\t\t\t\t\t\talt=\"FreeStyle Libre 2 CGM Sensor\"\n\t\t\t\t\t\t\twidth=\"213\"\n\t\t\t\t\t\t\theight=\"213\"\n\t\t\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t\t<div class=\"telyrx-product-list__content\">\n\t\t\t\t\t\t<p class=\"telyrx-product-list__name\">FreeStyle Libre 2 CGM Sensor<\/p>\n\t\t\t\t\t\t<span class=\"telyrx-product-list__cta telyrx-product-list__cta--yellow\">\n\t\t\t\t\t\t\tOrder Now\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t<\/div>\n\t\t\t<div class=\"telyrx-product-list-section__extra\">\n\t\t\t<p class=\"has-muted-color has-text-color has-urbanist-font-family\" style=\"font-size:0.875rem;font-style:italic;font-weight:400;line-height:1.571\"><strong>Important:<\/strong> Information on this page is for educational purposes only. Prescribing decisions are made by independent, licensed providers. TelyRx operates technology-enabled pharmacies and a telehealth platform that connects patients with board-certified licensed providers. Prescriptions, when provider-approved and issued, are filled and shipped by TelyRx-affiliated pharmacies. We do not employ physicians or make prescribing decisions. Learn more about our editorial standards <a href=\"\/blog\/editorial-standards\/\">here<\/a>.<\/p>\t\t<\/div>\n\t<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The FreeStyle Libre 2 system helps people with diabetes monitor their blood sugar levels. The system provides continuous glucose monitoring (CGM) and is designed to replace frequent fingerstick testing. <\/p>\n<p>A small sensor attaches to the arm, which provides real-time glucose readings through a physical reader and smartphone app.<\/p>\n","protected":false},"author":2,"featured_media":7553,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"single-medication","format":"standard","meta":{"content-type":"","telyrx_subtitle":"Uses, Side Effects, Dosage & FAQs (2026 Guide)","telyrx_last_updated":"2026-04-03T14:26","telyrx_reviewer_name":"Ashley Robinson","telyrx_reviewer_credentials":"PharmD","telyrx_reviewer_job_title":"Pharmacy Manager","telyrx_reviewer_affiliation":"TelyRx","telyrx_reviewer_url":"","telyrx_show_reviewer_job_title":"0","telyrx_show_reviewer_affiliation":"0","telyrx_show_toc":"1","footnotes":"","_telyrx_clean_url":"\/medications\/freestyle-libre-2-sensor\/what-is\/"},"categories":[86],"tags":[],"class_list":["post-7552","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medications"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Is the FreeStyle Libre 2 CGM Sensor? - TelyRx Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is the FreeStyle Libre 2 CGM Sensor?\" \/>\n<meta property=\"og:description\" content=\"The FreeStyle Libre 2 system helps people with diabetes monitor their blood sugar levels. The system provides continuous glucose monitoring (CGM) and is designed to replace frequent fingerstick testing. A small sensor attaches to the arm, which provides real-time glucose readings through a physical reader and smartphone app.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/\" \/>\n<meta property=\"og:site_name\" content=\"TelyRx Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-03T14:26:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-07T18:43:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"900\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Mariah Powers\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mariah Powers\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/\"},\"author\":{\"name\":\"Mariah Powers\",\"@id\":\"https:\/\/telyrx.com\/blog\/#\/schema\/person\/f1042a29c24ab7dd3c5f0fff9a06746b\"},\"headline\":\"What Is the FreeStyle Libre 2 CGM Sensor?\",\"datePublished\":\"2026-04-03T14:26:39+00:00\",\"dateModified\":\"2026-04-03T14:26:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/\"},\"wordCount\":1679,\"publisher\":{\"@id\":\"https:\/\/telyrx.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg\",\"articleSection\":[\"Medications\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/\",\"url\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/\",\"name\":\"What Is the FreeStyle Libre 2 CGM Sensor? - TelyRx Blog\",\"isPartOf\":{\"@id\":\"https:\/\/telyrx.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg\",\"datePublished\":\"2026-04-03T14:26:39+00:00\",\"dateModified\":\"2026-04-07T18:43:31+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#primaryimage\",\"url\":\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg\",\"contentUrl\":\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg\",\"width\":900,\"height\":900,\"caption\":\"What Is the FreeStyle Libre 2 CGM Sensor?\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/telyrx.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What Is the FreeStyle Libre 2 CGM Sensor?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/telyrx.com\/blog\/#website\",\"url\":\"https:\/\/telyrx.com\/blog\/\",\"name\":\"TelyRx Blog\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/telyrx.com\/blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/telyrx.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/telyrx.com\/blog\/#organization\",\"name\":\"TelyRx Blog\",\"url\":\"https:\/\/telyrx.com\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/telyrx.com\/blog\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2025\/02\/TelyRx-color-with-tag-1.png\",\"contentUrl\":\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2025\/02\/TelyRx-color-with-tag-1.png\",\"width\":227,\"height\":72,\"caption\":\"TelyRx Blog\"},\"image\":{\"@id\":\"https:\/\/telyrx.com\/blog\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/telyrx.com\/blog\/#\/schema\/person\/f1042a29c24ab7dd3c5f0fff9a06746b\",\"name\":\"Mariah Powers\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/secure.gravatar.com\/avatar\/734649c70b9e51c3bd1d106626c4a11df0b8c186e9bb7a270c1df74bfa7fd018?s=96&d=mm&r=g\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/734649c70b9e51c3bd1d106626c4a11df0b8c186e9bb7a270c1df74bfa7fd018?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/734649c70b9e51c3bd1d106626c4a11df0b8c186e9bb7a270c1df74bfa7fd018?s=96&d=mm&r=g\",\"caption\":\"Mariah Powers\"},\"description\":\"Mariah Powers is a wellness content strategist and writer with over seven years' experience developing clear, informative narratives on complex health topics for pharmaceutical manufacturers, hospitals, therapy clinics, and clean-living companies. Leveraging SEO product development insights, she crafts data-driven health topics, empowering readers to live healthier, happier lives.\",\"url\":\"https:\/\/telyrx.com\/blog\/author\/mariah-powers\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"What Is the FreeStyle Libre 2 CGM Sensor? - TelyRx Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/","og_locale":"en_US","og_type":"article","og_title":"What Is the FreeStyle Libre 2 CGM Sensor?","og_description":"The FreeStyle Libre 2 system helps people with diabetes monitor their blood sugar levels. The system provides continuous glucose monitoring (CGM) and is designed to replace frequent fingerstick testing. A small sensor attaches to the arm, which provides real-time glucose readings through a physical reader and smartphone app.","og_url":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/","og_site_name":"TelyRx Blog","article_published_time":"2026-04-03T14:26:39+00:00","article_modified_time":"2026-04-07T18:43:31+00:00","og_image":[{"width":900,"height":900,"url":"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg","type":"image\/jpeg"}],"author":"Mariah Powers","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Mariah Powers","Est. reading time":"8 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#article","isPartOf":{"@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/"},"author":{"name":"Mariah Powers","@id":"https:\/\/telyrx.com\/blog\/#\/schema\/person\/f1042a29c24ab7dd3c5f0fff9a06746b"},"headline":"What Is the FreeStyle Libre 2 CGM Sensor?","datePublished":"2026-04-03T14:26:39+00:00","dateModified":"2026-04-03T14:26:39+00:00","mainEntityOfPage":{"@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/"},"wordCount":1679,"publisher":{"@id":"https:\/\/telyrx.com\/blog\/#organization"},"image":{"@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#primaryimage"},"thumbnailUrl":"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg","articleSection":["Medications"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/","url":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/","name":"What Is the FreeStyle Libre 2 CGM Sensor? - TelyRx Blog","isPartOf":{"@id":"https:\/\/telyrx.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#primaryimage"},"image":{"@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#primaryimage"},"thumbnailUrl":"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg","datePublished":"2026-04-03T14:26:39+00:00","dateModified":"2026-04-07T18:43:31+00:00","breadcrumb":{"@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#primaryimage","url":"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg","contentUrl":"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/04\/freestylelibre2432_1.jpg","width":900,"height":900,"caption":"What Is the FreeStyle Libre 2 CGM Sensor?"},{"@type":"BreadcrumbList","@id":"https:\/\/telyrx.com\/blog\/medications\/what-is-freestyle-libre-2-sensor\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/telyrx.com\/blog\/"},{"@type":"ListItem","position":2,"name":"What Is the FreeStyle Libre 2 CGM Sensor?"}]},{"@type":"WebSite","@id":"https:\/\/telyrx.com\/blog\/#website","url":"https:\/\/telyrx.com\/blog\/","name":"TelyRx Blog","description":"","publisher":{"@id":"https:\/\/telyrx.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/telyrx.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/telyrx.com\/blog\/#organization","name":"TelyRx Blog","url":"https:\/\/telyrx.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/telyrx.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2025\/02\/TelyRx-color-with-tag-1.png","contentUrl":"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2025\/02\/TelyRx-color-with-tag-1.png","width":227,"height":72,"caption":"TelyRx Blog"},"image":{"@id":"https:\/\/telyrx.com\/blog\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/telyrx.com\/blog\/#\/schema\/person\/f1042a29c24ab7dd3c5f0fff9a06746b","name":"Mariah Powers","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/734649c70b9e51c3bd1d106626c4a11df0b8c186e9bb7a270c1df74bfa7fd018?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/734649c70b9e51c3bd1d106626c4a11df0b8c186e9bb7a270c1df74bfa7fd018?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/734649c70b9e51c3bd1d106626c4a11df0b8c186e9bb7a270c1df74bfa7fd018?s=96&d=mm&r=g","caption":"Mariah Powers"},"description":"Mariah Powers is a wellness content strategist and writer with over seven years' experience developing clear, informative narratives on complex health topics for pharmaceutical manufacturers, hospitals, therapy clinics, and clean-living companies. Leveraging SEO product development insights, she crafts data-driven health topics, empowering readers to live healthier, happier lives.","url":"https:\/\/telyrx.com\/blog\/author\/mariah-powers\/"}]}},"_links":{"self":[{"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/posts\/7552","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/comments?post=7552"}],"version-history":[{"count":4,"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/posts\/7552\/revisions"}],"predecessor-version":[{"id":7656,"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/posts\/7552\/revisions\/7656"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/media\/7553"}],"wp:attachment":[{"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/media?parent=7552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/categories?post=7552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/telyrx.com\/blog\/wp-json\/wp\/v2\/tags?post=7552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}