Can a Blood Pressure Watch Replace a Traditional Cuff?

The Appeal of Continuous, Convenient Monitoring

High blood pressure is one of the most significant modifiable risk factors for cardiovascular disease. Frequent and accurate monitoring is vital, yet traditional sphygmomanometers can be inconvenient for daily life. Blood pressure watches use methods such as photoplethysmography (PPG), pulse transit time (PTT), or bioimpedance to estimate blood pressure noninvasively.

These devices can log readings during daily activities, offering richer data for prevention and treatment. Wearable BP measurement dates back to the early 1990s, but recent advances in sensor technology and machine learning have brought accuracy closer to clinical standards. Modern devices such as the Huawei Watch D, Omron HeartGuide, Samsung Galaxy Watch, and other PPG-based wearables are now being tested under rigorous scientific protocols.

What the Research Actually Shows About Accuracy

Several peer-reviewed studies have directly compared blood pressure watches to gold-standard mercury sphygmomanometers or validated automated cuffs.

• The Huawei Watch D has repeatedly met the AAMI/ESH/ISO 81060-2:2018 validation criteria, with mean differences of less than 1 mmHg for both systolic and diastolic BP compared to reference measurements. This accuracy held across various demographics and health conditions.
• The Omron HeartGuide, a watch-type oscillometric device, has shown strong agreement with conventional ambulatory BP monitors both in-office and out-of-office, with mean differences as low as 0.8 mmHg in some settings.
• The Samsung Galaxy Watch 4 using PPG technology demonstrated strong correlation for systolic BP with reference devices, although diastolic readings were moderately correlated and accuracy varied depending on measurement context.
• The Samsung Galaxy Watch Active 2 tended to overestimate low BPs and underestimate high BPs when tested across hypertensive and normotensive individuals, and did not meet clinical accuracy standards.

Clinical and Practical Implications

For clinical hypertension management, precision matters. Guidelines typically require devices to have an average error of no more than 5 mmHg and a standard deviation under 8 mmHg. Devices such as the Huawei Watch D and Omron HeartGuide are beginning to meet these requirements, but others fall short, especially in more challenging conditions such as extreme BP ranges, during exercise, or in patients with arrhythmias.

One major advantage of blood pressure watches is data frequency. Continuous or frequent monitoring can detect masked hypertension, morning BP surges, and variability patterns that a single office reading might miss. These patterns are valuable for guiding individualized treatment plans and may help reduce the risk of long-term cardiovascular damage.

Technology Challenges and Future Directions

• Calibration requirements – Many watches still require regular calibration against a traditional cuff.
• Skin tone and physiology effects – PPG accuracy can be affected by skin pigmentation, wrist hair, or arterial stiffness, which can lead to inequities in performance.
• Cuffless measurement standards – Regulatory bodies have not yet established uniform accuracy standards for non-cuff-based BP devices, making validation inconsistent.

Newer technologies are working to address these issues. Bioimpedance-based sensors, for example, may offer more equitable performance across different demographics. Advanced AI algorithms can correct for biases in real time, potentially eliminating the need for regular calibration. These advances could make blood pressure watches more reliable for both clinical and personal use.

The most practical approach today is a hybrid strategy: use a validated blood pressure watch for frequent, day-to-day monitoring, but periodically confirm readings with a traditional, clinically validated cuff. With rapid improvements in sensor design, signal processing, and artificial intelligence, the time may come when the watch on your wrist can fully replace the cuff in the clinic.