Most people get their cholesterol checked once a year and weigh themselves most mornings. The two data sets almost never meet. A new partnership between Withings and Function tries to fix that, and the approach is simple enough to be useful.
Announced on October 22, 2026, the integration connects Withings’ connected devices with Function’s lab testing platform. Data flows in both directions, so neither company’s users have to export spreadsheets or carry screenshots to an appointment.
What the integration does
Function members can sync daily readings from Withings devices, including body composition and blood pressure, directly into the Function app. That gives periodic lab results a continuous backdrop. A single LDL number means more when you can see what weight and blood pressure did in the months around it.
The reverse also works. Results from Function’s 160+ lab tests, which cover heart health, hormones, thyroid, nutrients and more, sync into the Withings app. There they sit next to the activity, sleep and cardiovascular data Withings users already collect.
The companies offer an example. A woman in her mid-forties notices disrupted sleep and a shifting body composition, though her routine hasn’t changed. Those signals are ambiguous alone. Hormonal? Metabolic? Something to raise with her doctor? With trends from her Withings devices and labs such as LDL cholesterol, HbA1c, ferritin and TSH in one view, she can bring numbers to the appointment instead of a list of symptoms.
Pricing and availability
The integration is live now in the U.S. Both companies attached offers to the launch:
- Withings users get a $30 credit toward a Function subscription, applied automatically through a dedicated Function section in the Withings app.
- Function members get 10% off Withings products, available through the Function app.
Function membership costs $365 per year, about $1 a day, and includes access to the 160+ lab tests, including biannual testing. MRI and CT scans are available at extra cost. Details on getting started are at withings.com/en-us/pages/withings-function.
Why it matters clinically
Withings has more than 15 million users worldwide and has built its reputation on clinical-grade home measurement. Function has pushed direct-to-consumer lab testing toward a subscription model with a layer of interpretation on top, which it calls Medical Intelligence. Put them together and you get something closer to a longitudinal record than either offers alone.
The timing makes sense. Many people are managing weight, metabolic health or cardiovascular risk, and a growing group is tracking changes while taking GLP-1 medications. For them, a scale reading and a lab panel answer different questions. Weight tells you the direction. Labs can show whether nutrients, glucose control or lipids are moving with it.
Eric Carreel, Withings’ chairman and co-founder, framed it as a story told over time rather than a moment. Jonathan Swerdlin, Function’s CEO, said health information should live in one place. Both are marketing lines, but the underlying point holds. Clinicians often struggle with fragmented data, and patients who arrive with organized trends tend to have more productive visits.
What to watch
The announcement doesn’t say how the combined data will be interpreted, or whether Function’s Medical Intelligence will draw conclusions from Withings measurements. That matters. Consumer devices and lab results come with different error margins, and a dashboard that implies correlation can mislead as easily as it informs. Clinicians will reasonably want to know how insights are generated and how they’re framed for patients.
Privacy is another open question, since two companies are now exchanging sensitive data. Neither company addressed it in the release.
Still, the direction is right. Connecting what people measure daily with what labs reveal periodically is a practical step toward more informed conversations between patients and doctors. Whether it improves outcomes is something only real-world use will show.