Overview

• The feature is now live on Apple Watch Series 9 and later and Apple Watch Ultra 2 and later, with setup in the iPhone Health app starting a 30‑day data collection period before any notifications can appear.
• Apple uses a new algorithm on optical heart-sensor trends rather than taking cuff-style readings, so the watch does not measure blood pressure directly.
• Eligibility is limited to users 22 or older who are not pregnant and have not been diagnosed with hypertension, and Tom’s Guide notes an iPhone 11 or later and wrist detection are required to enable it.
• If a notification is triggered, users are prompted to begin a Blood Pressure Log and take measurements with a third‑party cuff for seven days, then share results with a healthcare professional.
• The Health app sends morning and evening reminders and records systolic and diastolic values, with options for a 7‑day detection log or a 4‑week log for monitoring, and Apple cautions the tool is not diagnostic and may miss some cases.