Apple is set to include blood pressure readings in its upcoming Apple Watch Series 11 and Watch Ultra 3, which are expected to be announced in September 2025.

The company's approach to measuring blood pressure will utilize photoplethysmography (PPG), a method that detects blood flow through light variations rather than providing exact diastolic and systolic readings.

Instead of offering precise numerical values, users will receive alerts for elevated blood pressure, effectively creating a hypertension alert system.

Apple's cautious integration of blood pressure monitoring aims to ensure more reliable readings without the need for frequent calibration against traditional inflatable cuffs.

This contrasts with the traditional method of measuring blood pressure, which typically involves an inflatable cuff, and highlights the unique approach Apple is taking.

A recent study indicated that a PPG sensor, when combined with machine learning, could detect hypertension with an impressive accuracy of 92.42%, showcasing the potential for advanced blood pressure monitoring.

However, studies have also shown that PPG sensors may have limited accuracy when using a single-site sensor, as they lack context about the wearer's wrist and skin characteristics.

An Apple patent hints at the possibility of a watch using an inflatable strap filled with liquid to measure blood pressure, although many patents do not necessarily lead to actual products.

There have been discussions about a potential Apple smart ring that could enhance PPG readings, but according to Mark Gurman, Apple currently has no plans to launch such a device.