# Google Research smartwatch method detected hypertension with 90.0% specificity in a 196-person study

- Published: 2026-11-05 20:29 UTC
- Section: Life & Health › Medicine
- Tags: hypertension detection, smartwatch blood pressure, cuffless screening, photoplethysmography, ambulatory blood pressure monitoring, opportunistic screening, Nature study, sensitivity and specificity, wearable diagnostics
- URL: https://realtech.media/news/rt-7f5c83144122a1bd20d77571_google_research_smartwatch/

**In a prospective study of 196 participants, a cuffless smartwatch method detected hypertension with 65.8% sensitivity against 24-hour ambulatory monitoring. Authors propose it for screening.**

![Google Research smartwatch method detected hypertension with 90.0% specificity in a 196-person study](https://sgzwpqqelzmajkcubgkl.supabase.co/storage/v1/object/public/rt-media/2026/11/027bafc43cfb1663.jpg)
*Jiri Brozovsky from Ostrava, Czech Republic, Wikimedia Commons, CC BY 2.0*

Researchers at Google Research, the University of Washington and Beth Israel Deaconess Medical Center report in Nature a method that detects hypertension from signals recorded by a consumer smartwatch, without cuff calibration [1]. The algorithm analyzes two types of waveforms: photoplethysmography and accelerometry. It was validated in a prospective, multicenter study of 196 participants, with 24-hour ambulatory blood pressure monitoring as the gold standard [1].

The participants were diverse, with no known cardiovascular disease and no antihypertensive medication [1]. Monitoring lasted seven days in real-world conditions [1]. According to the authors, the detection accuracy is comparable to that of traditional cuffed blood pressure devices within the existing clinical framework [1].

## Accuracy against ambulatory monitoring

The smartwatch method showed a sensitivity of 65.8% (95% CI, 54.0%-76.3%), a specificity of 90.0% (95% CI, 83.2%-94.7%) and a positive predictive value (PPV) of 80.6% (95% CI, 68.6%-89.6%) [1].

For comparison, initial office blood pressure screening in the same study gave a sensitivity of 55.3% (95% CI, 43.4%-66.7%), a specificity of 90.0% (95% CI, 83.2%-94.7%) and a PPV of 77.8% (95% CI, 64.4%-88.0%) [1].

## Intended use: opportunistic screening

The authors note that more than half of adults with hypertension are unaware of their condition, and that early intervention is critical for preventing major adverse cardiovascular events [1]. They propose that consumer smartwatches could support population-level opportunistic screening [1].

In this scheme, the watch prompts at-risk individuals to seek clinical assessment. The diagnosis is then confirmed with established cuff-based methods [1]. The work was published in Nature; the corresponding author is Ming-Zher Poh. The study covered participants without known cardiovascular disease and without antihypertensive treatment, so the reported figures apply to this group.

## Sources

1. [Nature](https://www.nature.com/articles/s41586-026-11336-3)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-7f5c83144122a1bd20d77571_google_research_smartwatch/