How to choose a wearable for health tracking

Start with your question

Wearables are most useful when you buy one to answer a specific question. Am I moving enough? Am I sleeping at regular times? Is my blood pressure under control? How do my meals affect my blood sugar? Each question points to a different tool, and no single device does everything well.

Without a question, wearables tend to produce a stream of scores that can increase anxiety without changing behavior.

Wellness features versus medical features

FDA treats many wearable features as general wellness functions, which are low-risk products intended to support a healthy lifestyle rather than to diagnose or treat disease. FDA finalized updated guidance on this policy in January 2026. Features making disease claims, such as detecting an irregular heart rhythm, generally need FDA clearance for that specific function.

Clearance applies to a particular feature, not to the whole device. A watch may have an FDA-cleared rhythm feature while its sleep score or recovery score is a wellness feature that FDA has not reviewed. Check the manufacturer's information for each feature you care about.

Smartwatches and fitness bands

Devices from widely known brands such as Apple, Samsung, Garmin and Fitbit track steps, heart rate, workouts and estimated sleep. They are good at showing trends in activity and resting heart rate. Optical heart rate can be less accurate during intense or irregular movement, and calorie estimates are rough.

Some models offer FDA-cleared features, such as ECG recording or irregular rhythm notifications. A notification is a prompt to talk with a clinician, not a diagnosis.

Smart rings

Rings such as the Oura Ring focus on sleep timing, resting heart rate, heart rate variability and skin temperature trends. Many people find them easier to wear overnight than a watch. Sleep staging from any consumer wearable is an estimate and does not replace a sleep study when sleep apnea or another sleep disorder is suspected.

Home blood pressure cuffs

For blood pressure, a dedicated cuff beats any watch. The American Heart Association recommends an automatic upper-arm cuff and advises against wrist and finger monitors because they are less reliable. Look for a device on the US Blood Pressure Validated Device Listing at validatebp.org, use the correct cuff size and take two readings a minute apart after resting for five minutes.

Home readings are also how the USPSTF suggests confirming a high blood pressure diagnosis before treatment.

Over-the-counter glucose monitors

In March 2024, FDA cleared the Dexcom Stelo Glucose Biosensor System as the first over-the-counter continuous glucose monitor, for adults 18 and older who do not use insulin. It is not intended for people with problematic low blood sugar, because it does not alert users to dangerous lows. A CGM can show how particular meals, sleep and exercise affect your glucose, which some people find motivating.

Normal glucose naturally rises after meals. Small spikes are not a disease, and chasing a perfectly flat line can lead to unnecessary food restriction.

Privacy and data ownership

Health data from consumer devices is not always protected the same way as records held by your clinician. Before you buy, read how the company stores your data, whether it shares or sells it, and whether you can export or delete it. Some features also require an ongoing subscription; check what you can see without one.

Getting reliable readings

Fit and consistency matter more than brand. Wear a watch snugly above the wrist bone, charge devices so they do not miss nights, and compare trends week to week rather than day to day. For blood pressure, bring your cuff to an appointment once a year to compare with an office reading. For a CGM, follow the instructions for sensor placement and note meals and exercise so the numbers have context.

Red flags in wearable marketing

• Claims that a device can diagnose a condition without FDA clearance for that use
• Proprietary readiness or biological age scores presented as precise
• Blood pressure from a watch or ring offered as a substitute for a validated cuff
• Subscriptions required to see your own basic data, without clear disclosure
• Vague privacy policies about selling or sharing health data

Using wearable data with a clinician

Bring summaries, not raw streams: average resting heart rate, typical sleep window, weekly activity minutes, a week of blood pressure readings or a few days of CGM patterns. Data is most useful when it answers a question you and your clinician have agreed on.