Peripheral Arterial Tonometry (PAT) Technology
PAT has become the dominant sensor technology in 2026 for its ability to measure sleep without bulky chest belts or nasal cannulas.
How it Works: Instead of measuring airflow at the nose, PAT sensors (like WatchPAT One) measure changes in the volume of blood in the fingertip arteries, which constrict during an apnea event.
Accuracy: Recent 2026 validation studies show PAT technology has a 90% correlation with in-lab Polysomnography (PSG) for diagnosing moderate-to-severe Obstructive Sleep Apnea (OSA).
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