The existing wearable arm sensor family Libre Duo 10 Day now extends to also read ketones
Thirunavukkarasye-RaveendranCC BY 4.0
Illustrative: an existing Abbott FreeStyle Libre glucose sensor, not the unreleased Libre Duo 10 Day. No photograph of the new dual glucose and ketone device exists yet ahead of its later 2026 launch.
The FDA Just Cleared the First Wearable That Tracks Ketones Around the Clock, and It Was Not Built for Keto Dieters
I have been waiting for a device like this without knowing it was coming. Every keto tracker on the market right now, a finger prick strip or a breath meter, gives you one blurry snapshot of your ketones and then goes quiet until you test again. On August 25, Abbott received FDA authorization for a wearable that tracks ketones continuously, all day and all night, for the first time. Here is the part almost nobody covering this story is going to get right: it was not built for you.
- Abbott's Libre Duo 10 Day received FDA marketing authorization on August 25, becoming the first wearable cleared to track glucose and ketones together, sampling every minute for ten days.
- It was authorized to catch diabetic ketoacidosis in people with diabetes, a dangerous spike in ketones, not to help someone track a ketogenic diet.
- The clearance came through the FDA's De Novo pathway, which is different from full premarket approval, and US retail launch is not expected until later this year.
- Continuous ketone data has never existed for consumers before, so once this reaches the keto and biohacking crowd off label, it will change what is actually knowable about staying in ketosis.
What actually got authorized
Libre Duo 10 Day is a single sensor worn on the back of the arm that measures both glucose and ketone levels in the fluid just under your skin, sampling once a minute, for up to ten days on one sensor. It streams both numbers to a smartphone app with trend arrows, the same way Abbott's existing Libre glucose sensors already work. The FDA cleared it through what is called the De Novo pathway, the route used for a genuinely new kind of device with no existing product to compare it against, which is what makes this a real first rather than a small update to something that already existed. US retail launch is planned for later this year, so as of this writing nobody outside the clinical trials has actually used one.
The reason it exists is a medical emergency, not a diet
The FDA authorized Libre Duo 10 Day to detect rising ketones in people with diabetes, specifically to catch diabetic ketoacidosis before it turns dangerous. In someone with diabetes, climbing ketones are not a sign the body is burning fat efficiently, they are a warning sign that insulin has dropped critically low and the blood is turning acidic, a medical emergency that can develop over hours. The device is designed to work alongside automated insulin delivery systems and to push an alert to a person's phone so they can take corrective insulin or get fluids before the situation gets worse. That is the entire reason this sensor exists. Nutritional ketosis, the mild, intentional ketone elevation someone on a ketogenic diet is trying to reach, was never part of the approval.
Why the same molecule means two different things
This is the piece almost every other outlet covering this story is going to skip, and it is the one that actually matters if you eat keto. Ketones in someone with diabetes and ketones in someone doing a ketogenic diet on purpose are the same molecule read completely differently depending on who is wearing the sensor. Nutritional ketosis generally sits somewhere around zero point five to three millimoles per liter, the range a keto dieter is often trying to reach and hold. Diabetic ketoacidosis is typically diagnosed above three millimoles per liter alongside high blood glucose and a drop in blood pH, a genuine emergency. A number that means progress in one context means call your doctor in the other, and no consumer device or headline is going to draw that line for you automatically.
Why this is worth watching anyway
None of this means the device is uninteresting to anyone outside its approved use, it just means the honest framing matters. Every consumer keto tool right now is intermittent and rough, a finger stick strip that only captures one moment, or a breath meter whose accuracy nobody has really nailed down. A device that samples ketones every minute for ten days straight, even one built for a different purpose, would change what a curious keto dieter could actually learn: how long a given meal or fast really keeps someone in ketosis, what knocks them out of it, whether so called keto flu tracks anything measurable at all. That is genuinely new territory, once the device is available and once anyone has actually used it off label to find out.
Honest caveat
Read the source for this one before you get excited. Everything here comes from Abbott's own announcement plus two independent trade outlets that covered the authorization, not from the FDA's own De Novo decision record, which was not retrieved for this piece. No accuracy data for the ketone reading has been published or reviewed, so nothing here is a claim about how reliable the number actually is, only that the device produces one continuously. De Novo authorization is not the same thing as full premarket approval, and describing this as the FDA approving a keto tracker misstates both halves of that sentence. The device is not yet available. Abbott says later this year, which is a company estimate, not a confirmed date, and nobody outside the clinical trials has used one in the real world yet.
What this means for you
If you are on a ketogenic diet and you have been guessing at your ketone level from a strip or a breath meter, this device is worth watching, not buying yet, since it is not for sale. When it does reach the market later this year, remember that continuous ketone tracking was cleared as a safety tool for people with diabetes, and using it to chase nutritional ketosis will be a real but off label use, the same way plenty of biohackers already use continuous glucose monitors made for diabetes to watch their own blood sugar. That is not necessarily wrong, but it means nobody has validated the ketone reading for your use case, and if you actually have diabetes, rising ketones on this device are a warning to act on, never a number to try to push higher.
Primary sources
- Abbott receives FDA authorization for world's first dual glucose ketone sensing technology for people with diabetes, Abbott Media Room, August 25, 2026
- Abbott Receives FDA Authorization for Libre Duo 10 Day, World's First Dual Glucose Ketone Sensing System, HIT Consultant, August 26, 2026
- FDA Authorizes First Wearable Device to Continuously Monitor Glucose, Ketones, Patient Care Online
Common questions
Is this a device for tracking a ketogenic diet?
No, not officially. Libre Duo 10 Day was authorized by the FDA to detect diabetic ketoacidosis in people with diabetes, a dangerous spike in ketones. Using it to track nutritional ketosis on a keto diet would be an off label use, something the device was not tested or approved for.
When can I actually buy one?
Abbott has said US retail launch is planned for later this year, but that is a company estimate rather than a confirmed date, and as of this writing the device is not yet available to buy.
What is the difference between nutritional ketosis and diabetic ketoacidosis?
They involve the same molecule at very different levels for very different reasons. Nutritional ketosis, the mild ketone elevation a keto dieter aims for, generally runs from about zero point five to three millimoles per liter. Diabetic ketoacidosis, a medical emergency, is typically diagnosed above three millimoles per liter alongside high blood glucose and a drop in blood pH. One is a diet goal, the other is a reason to seek medical care.
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