No — no smartwatch or ring holds FDA authorization to read blood glucose through skin, so readings must come from a sensor-based CGM.
On February 21, 2024, the FDA issued a safety communication telling consumers to stop buying and using watches and rings that claim to measure glucose without piercing the skin.
Whether glucose monitoring watches work comes down to where the number is born. If a sensor sits under your skin, the data is real and a watch can display it. If nothing touches your skin, no direct glucose measurement is happening.
Glucose Monitoring Watches: Where The FDA Stands Today
As of that notice, the FDA had not authorized, cleared, or approved any smartwatch or smart ring to measure or estimate blood glucose on its own. The warning covers every brand making a no-needle claim, including products sold online and directly by the manufacturer.
None had been reviewed for safety or effectiveness. A wrong number becomes a wrong dose: inaccurate readings can lead someone to take too much insulin or too much of a sulfonylurea, and overdosing can trigger severe hypoglycemia, confusion, coma, or death within hours. Harvard Health’s coverage lands on the same point about the treatment decisions that follow a bad reading.
Regulators pointed people back to FDA-authorized glucose meters or CGMs, used with a clinician’s guidance. The FDA safety communication on smartwatch glucose claims states plainly that no such noninvasive device has been authorized — a conclusion drawn from the agency’s own review records, not from product marketing.
Wellness estimates are the middle ground people overlook. Heart-rate, sleep, and activity tracking are genuinely useful numbers, and none of them is a glucose reading.
| Setup | Where The Number Comes From | Use For Dosing? |
|---|---|---|
| Standalone “noninvasive” watch | Claimed skin reading, never FDA-reviewed | No — avoid it |
| Smart ring claiming glucose sensing | Claimed skin reading, never FDA-reviewed | No — avoid it |
| Watch paired with Stelo app 3.3 or later | Sensor under the skin, sent to the watch | Only as your clinician directs |
| Watch paired with app 3.2 or earlier | Sensor data relayed through the phone | Only as your clinician directs |
| Watch running a CGM maker’s own app | Sensor data shown as the maker designed | Only as your clinician directs |
| Heart rate, sleep, step tracking | Optical and motion sensors | No — not a glucose value |
| Fingerstick meter | Blood drop on a test strip | Yes — standard confirmatory check |
Can A Smartwatch Show CGM Readings Instead?
Yes — a watch can display, trend, and alert on data from an authorized continuous glucose monitor. The measurement still comes from the sensor under your skin; the watch is a screen, not the sensor.
Dexcom’s Stelo is one current example documented in official materials. Its compatibility page states that, starting with Stelo app version 3.3, glucose data can be sent straight to an Apple Watch even when the phone is not nearby. On app version 3.2 or earlier, the watch has to stay connected to the phone and within range. Supported watches must also meet minimum operating-system requirements — the page lists Apple Watch OS 11.6 as one.
That version line is where most people get tripped up. Below it, the phone stays in the loop; on 3.3 or later with a supported watch, the watch can work on its own.
Compatibility varies by phone, watch model, operating system, app version, region, and CGM setup, so verify your exact combination before assuming it works. To compare hardware side by side, our tested glucose monitoring watch roundup sorts the options built to pair with authorized sensors.
The Mistakes That Turn A Bad Reading Into A Dangerous Dose
Most harm starts with one mix-up: assuming a watch that shows a glucose number also produced it.
- Confusing a watch displaying CGM data with a watch measuring glucose itself.
- Reading “needle-free” or “noninvasive” as proof of FDA authorization.
- Calculating an insulin dose from an unreviewed watch reading.
- Assuming one CGM works with every Apple Watch or Android watch.
- Skipping a confirmatory check when a reading clashes with how you feel.
What holds up for anything that touches medication: an FDA-authorized meter or CGM, used per the maker’s instructions, with a clinician in the loop. Three moves cover the rest.
- Treat any needle-free glucose claim as unverified and skip it.
- Confirm the chain — authorized CGM, supported watch, current app version.
- Make dosing decisions from an authorized device, following your clinician’s plan.
Common Questions
Has The FDA Cleared Any Watch To Measure Glucose On Its Own?
Not as of the February 21, 2024 safety communication. The agency said it had not authorized, cleared, or approved any smartwatch or smart ring to measure or estimate blood glucose by itself, and advised consumers not to buy devices claiming needle-free sensing through the skin.
Why Does A Skin Sensor Change The Answer?
A continuous glucose monitor places a small sensor under the skin and measures glucose in interstitial fluid, which is why its readings can guide treatment. A noninvasive watch claims to read through intact skin with no sensor at all, and the FDA has not reviewed those claims for safety or accuracy.
What Should I Do If My Watch Reading Looks Wrong?
Trust your body first. If a reading clashes with symptoms like shakiness, sweating, or confusion, confirm with an FDA-authorized meter and follow your care plan rather than adjusting medication from the watch. The FDA’s advice is to choose an authorized glucose-measuring device with help from a healthcare professional.
Sources
- U.S. Food and Drug Administration. “Do Not Use Smartwatches or Smart Rings to Measure Blood Glucose Levels.” Safety communication dated February 21, 2024 covering noninvasive glucose claims.
- Reuters. “FDA warns consumers over use of smartwatches to measure blood glucose levels.” Same-day reporting on the scope of the warning.
- Harvard Health Publishing. “FDA warns against using these smart gadgets to measure blood sugar.” Clinical framing of the dosing risk behind inaccurate readings.