FDA-Approved Health Features Coming to Smartwatches

Consumer smartwatches are rapidly evolving from fitness trackers into legitimate health monitoring devices. The FDA has cleared several groundbreaking features in recent years, and more are in the pipeline. Here's what's already available, what's coming soon, and what it means for your health.

Already FDA-Cleared and Available

ECG (Electrocardiogram)

Available on: Apple Watch Series 4+, Samsung Galaxy Watch 4+, Fitbit Sense series, Google Pixel Watch 2

The ECG feature records a single-lead electrocardiogram by having you touch the watch crown or bezel for 30 seconds. It's FDA-cleared (De Novo classification) to detect atrial fibrillation (AFib), a heart rhythm irregularity that affects 6 million Americans and increases stroke risk fivefold.

The Apple Watch ECG has been validated in clinical studies to identify AFib with 98.3% sensitivity and 99.6% specificity in classifiable recordings. Multiple real-world cases document the Apple Watch detecting undiagnosed AFib and prompting life-saving medical intervention.

Limitation: Single-lead ECG cannot detect all heart conditions. It identifies AFib specifically and may classify other arrhythmias as "inconclusive."

Irregular Heart Rhythm Notifications

Available on: Apple Watch, Samsung Galaxy Watch, Google Pixel Watch

Distinct from the ECG feature, this passive monitoring uses the optical heart rate sensor to continuously check for irregular rhythms. If it detects a pattern consistent with AFib, it sends a notification. This is FDA-cleared as a screening tool — not a diagnostic one.

Blood Oxygen Monitoring (SpO2)

Available on: Most major smartwatches and fitness trackers

SpO2 monitoring measures blood oxygen saturation levels. While most implementations are classified as wellness features (not FDA-cleared medical devices), they can flag concerning drops in oxygen levels during sleep that may indicate sleep apnea or other respiratory conditions.

Sleep Apnea Detection

Available on: Apple Watch Series 10+, Samsung Galaxy Watch (pending full rollout)

The Apple Watch Series 10 received FDA authorization to detect signs of moderate to severe obstructive sleep apnea using the accelerometer to measure breathing disturbances during sleep. This is significant because an estimated 80% of moderate-to-severe sleep apnea cases go undiagnosed.

Samsung's Galaxy Watch received similar FDA clearance for sleep apnea detection, making it available to both major smartphone ecosystems.

Coming in the Near Future

Blood Pressure Monitoring

Samsung has offered blood pressure monitoring on Galaxy Watches in South Korea since 2020, but FDA clearance for the US market has been pending. The Samsung system requires calibration with a traditional blood pressure cuff every 4 weeks, which limits its standalone utility.

Apple has reportedly been developing cuffless blood pressure estimation for years. The technology would use pulse transit time — measuring how long it takes a pulse wave to travel from the heart to the wrist — to estimate blood pressure without calibration against a cuff.

Achieving FDA clearance for cuffless blood pressure is technically challenging because accuracy standards are strict. Expect this feature to arrive first as a "trend" indicator (showing whether your blood pressure is rising or falling over time) rather than providing exact systolic/diastolic numbers.

Continuous Glucose Monitoring (Non-Invasive)

Multiple companies are pursuing non-invasive glucose monitoring for smartwatches. The challenge is enormous — current CGM devices like Dexcom and FreeStyle Libre use a small needle inserted under the skin. Doing this optically from the wrist requires detecting glucose concentration through skin, fat, and muscle tissue.

Apple has reportedly invested over a decade and billions of dollars in this technology. Samsung and Google are also actively researching it. If achieved, non-invasive glucose monitoring would be transformative for the 37 million Americans with diabetes and potentially valuable for the broader population interested in metabolic health.

Realistic timeline: 3-5 years for a consumer device, and initial versions will likely require periodic finger-prick calibration.

Body Temperature Monitoring

The Apple Watch Series 8+ and Samsung Galaxy Watch 5+ already measure wrist skin temperature, but primarily for cycle tracking and baseline deviation detection. Future FDA applications could expand this to fever detection and illness early warning.

What This Means for Consumers

The Good

• Early detection of serious conditions (AFib, sleep apnea) that often go undiagnosed for years
• Longitudinal health data that provides context traditional doctor visits lack
• Democratized health monitoring — these features work for everyone who owns the device, not just those who schedule regular check-ups

The Caution

• FDA clearance does not mean medical equivalence. These features are screening tools, not diagnostic devices
• False positives can create unnecessary anxiety and emergency room visits
• No smartwatch feature should replace professional medical care
• The "worried well" effect — healthy people obsessing over normal physiological variations flagged by sensitive sensors

The Practical Advice

If your smartwatch flags an irregular heart rhythm, shows consistently low SpO2, or detects sleep apnea signs — take it seriously and schedule a doctor's appointment. Bring the data with you. Most physicians now recognize smartwatch health alerts as legitimate screening information worth investigating.

Don't use smartwatch health features to self-diagnose or avoid medical care. Use them as an early warning system that prompts professional evaluation when something looks off. That's exactly what FDA-cleared wearable features are designed to do.

---

As an Amazon Associate, BestElectronicsReviewed earns from qualifying purchases.