Continuous ketone monitors and ketone meters
Last checked September 28, 2026
This site gives general information, not medical advice. Talk to your doctor or diabetes team before changing how you monitor or treat any condition.
A continuous ketone monitor (CKM) is a small sensor worn on the skin that measures ketones all day and night, the way a continuous glucose monitor measures sugar. The first one to be authorized by the US Food and Drug Administration, Abbott’s Libre Duo 10 Day, was authorized on 25 August 2026. This site lays out the facts on every ketone monitor and meter: what each measures, where it is sold and what it costs.
What a continuous ketone monitor is
Ketones are made when the body breaks down fat for energy. The main one in the blood is beta-hydroxybutyrate (BHB). Until now people measured ketones one test at a time: a finger-prick blood meter, a urine strip or a breath meter. A CKM instead has a thin filament under the skin that reads ketones in the fluid between cells (interstitial fluid) every few minutes and sends the numbers to a phone. How they work.
- Medical: Abbott’s Libre Duo 10 Day measures glucose and ketones in one sensor, for people with diabetes aged 2 and over, on prescription (FDA). It also has a CE mark in Europe, with a 15-day adult version (Abbott). Neither is on sale yet.
- Consumer: SiBio’s KS3 is a ketone-only sensor sold to adults for diet tracking, on Amazon UK and SiBio’s own shop. The maker says it is not for diagnosing, treating or monitoring disease.
Who uses them
- People with type 1 diabetes and others at risk of DKA. Diabetic ketoacidosis happens when a lack of insulin lets ketones build up in the blood (NHS). Abbott’s sensor alarms when ketones go above 3.0 mmol/L. Ketone monitors and DKA.
- People on ketogenic diets who want to see their ketone level without repeated finger-pricks. Ketone monitoring on keto diets.
- Athletes and researchers, for example studies tracking ketone levels after ketone drinks (Kjær et al., 2026).
For people with type 1 diabetes, and others at risk of diabetic ketoacidosis (DKA), ketone levels are a medical matter. Follow the plan from your diabetes team and the guidance from the NHS or the American Diabetes Association. No consumer ketone sensor replaces the testing your care team asks for.
Quick comparison
Running costs are worked out from each maker’s or seller’s published price, for one sensor at a time or one test a day. The full comparison has wear time, apps and status by country.
| Device | Type | Measures | Availability | Running cost |
|---|---|---|---|---|
| Abbott Libre Duo 10 Day (and Libre Duo) | Continuous ketone sensor | Glucose and ketones in the fluid under the skin, from one sensor | Not on sale yet: US launch planned for later in 2026; first European countries later in 2026 | n/a |
| SiBio KS3 | Continuous ketone sensor | Ketones in the fluid under the skin (ketones only, no glucose) | On sale now to adults 18+ (SiBio ships internationally; Amazon UK) | £162.92 a month |
| Keto-Mojo GK+ | Blood ketone meter | Blood ketones and blood glucose from a finger-prick (a separate strip for each) | On sale now (US and UK shops) | $25.85 a month |
| Abbott Precision Xtra (US) / FreeStyle Optium (UK) | Blood ketone meter | Blood beta-hydroxybutyrate (β-ketone) from a finger-prick; the same meters also test glucose | On sale now; in the UK often prescribed | $152.05 a month |
| Ketoscan Mini | Breath ketone meter | Acetone in the breath, in parts per million (ppm), 0 to 99 ppm | On sale now | £3.95 a month |
| Ketonix Bronze | Breath ketone meter | Acetone in the breath, in ppm (not blood beta-hydroxybutyrate, as the maker points out) | On sale now | $0.00 a month |
| Ketostix (urine strips) | Urine ketone strips | Acetoacetate in urine (not beta-hydroxybutyrate) | On sale now | $7.60 a month |
| Lingo by Abbott | Glucose sensor (no ketones) | Glucose only: Lingo does not measure ketones | On sale now (glucose only) | £128.18 a month |
| Biosense (discontinued) | Breath ketone meter | Acetone in the breath | Discontinued: the company told users in Sep 2024 it had gone out of business | n/a |
Start here
Compare every device
Sensors, blood, breath and urine tests side by side.
Sensor vs blood vs breath vs urine
What each test actually measures.
Ketone levels explained
The published ranges, in mmol/L, with their sources.
Cost calculator
Monthly and yearly cost of any sensor or strip.
UK vs US
What you can buy where, today.
FAQ
Short answers to common questions.