Wondering where to put a FreeStyle Libre 3 sensor, or a FreeStyle Libre 2? Abbott, the company that makes the FreeStyle Libre, says it goes on the back of your upper arm: “The back of the upper arm is the recommended and approved application site” (Abbott Australia).

Thinking about another spot, such as your stomach, thigh or the front of your arm? Speak to your diabetes care team before you try it.

Last checked: 20 October 2026, against Abbott’s US Sensor Application & Adhesion Guide and Abbott Australia’s FreeStyle Libre 3 Plus sensor page.

Where on the back of your arm should a FreeStyle Libre go?

Abbott’s Sensor Application & Adhesion Guide for the FreeStyle Libre 2 and FreeStyle Libre 3 sets four rules for choosing your spot:

Abbott Australia adds two more: don’t use body lotion or cream where the sensor will go, and “Choose an area with the least hair or consider shaving the site”, because body hair can stop the sensor sticking properly.

New to the Libre? Our guide on how to apply and use the FreeStyle Libre walks through the applicator step by step.

Can you wear a FreeStyle Libre somewhere else?

Plenty of people ask whether the sensor can go somewhere other than the arm. Abbott’s answer is the same each time: the back of the upper arm is the approved site, and anywhere else is off-label. That makes it a conversation for your care team, not a decision to make from a blog post (this one included).

Can you put a FreeStyle Libre 3 on your stomach?

Abbott approves the FreeStyle Libre 3 for the back of the upper arm only, so the stomach is an off-label site. The stomach is also a common insulin injection area, and Abbott asks for at least 2.5 cm between the sensor and any injection site. If you’re considering it, talk to your diabetes care team first.

Can a FreeStyle Libre 3 go on your leg or thigh?

The thigh isn’t an Abbott-approved site for the FreeStyle Libre 3 or FreeStyle Libre 2. Abbott approves the back of the upper arm only, so check with your care team before wearing a sensor anywhere else.

Can you put a FreeStyle Libre on the front of your arm?

Abbott’s instructions name the back of the upper arm, so the front of the arm falls outside them. If the back of your arm doesn’t suit you, raise it with your care team.

What does the research say about other sites?

In a small 2022 study (Hall et al., Diabetes, Obesity and Metabolism), 20 adults with type 1 diabetes wore FreeStyle Libre sensors on the upper arm, upper chest and lower back at the same time. Under test conditions (after a meal, during exercise and with the skin cooled), the arm sensor was the most accurate, and the lower back had the most sensor failures. It’s one small study, and it doesn’t change Abbott’s instructions.

Why the site matters for keeping your sensor on

Where you wear a FreeStyle Libre affects how well it stays stuck, not just how it reads. Abbott’s guide warns against a site that bends or folds, and flags the everyday things that catch a sensor:

Sites away from the arm tend to face more friction and movement, from waistbands, belts and constant bending. And even on the back of the arm, a sensor still meets sleeves, bag straps and towels every day. For how placement works across different CGMs, see our CGM placement guide.

How to keep a FreeStyle Libre on the back of your arm

Abbott sets how long each sensor is worn: 14 days for the FreeStyle Libre 2 and 15 days for the FreeStyle Libre 3 Plus. These three steps help it last the distance.

Prep the skin

Abbott’s guide says: “Only use non-moisturizing, fragrance-free soap to wash the area where you’ll apply the sensor.” Wipe off any oily residue with an alcohol wipe, then let the skin dry completely. Our guide on how to prep your skin for patches covers this in more detail.

Use a skin adhesive wipe

An adhesive wipe leaves a thin, tacky layer that helps adhesive grip, which is useful in hot weather, during sport or if your skin is oily. Try our Skin Adhesive Wipes and follow the directions on the pack. Read more in how to use adhesive wipes to improve CGM and patch wear time.

Add an overpatch

An overpatch goes over the top of the sensor, covering its edges so they’re less likely to lift or catch. Type Strong FreeStyle Libre sensor patches fit the FreeStyle Libre 2 and FreeStyle Libre 3. Our fabric patches are designed to hold for 10+ days and are water resistant, so they cover the sensor and hold it flat through showers, swims and sweat. Browse the full FreeStyle Libre collection, or see our 5 tips and tricks to protect your FreeStyle Libre sensor.

People also ask

Where can you place a FreeStyle Libre sensor?

On the back of your upper arm. Abbott calls it “the recommended and approved application site” for the FreeStyle Libre, on a flat area at least 2.5 cm (1 inch) from any insulin injection site.

Can you put the FreeStyle Libre somewhere other than your arm?

Abbott approves the back of the upper arm only. Any other site is off-label, so talk to your diabetes care team before trying one.

Can I wear the FreeStyle Libre 3 on my stomach?

The stomach isn’t an Abbott-approved site for the FreeStyle Libre 3. Speak to your care team before wearing it there.

Can a FreeStyle Libre 3 go on the leg?

Abbott doesn’t approve the leg or thigh for the FreeStyle Libre 3. The approved site is the back of the upper arm.

Can I put my FreeStyle Libre on the front of my arm?

Abbott specifies the back of the upper arm, so the front of the arm is outside its instructions. Ask your care team if the back of your arm doesn’t work for you.

Does the needle stay in your arm with the FreeStyle Libre 2?

No. The applicator’s needle places the sensor and doesn’t stay in your arm. What sits under your skin is, in Abbott’s words, “a small (5mm) filament”. Read more in how does FreeStyle Libre work? and debunking 10 myths about the FreeStyle Libre.

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