What does the ankle-brachial index assess?

The ankle-brachial index (ABI) is a simple, non-invasive test that compares the blood pressure in a patient's ankle to the blood pressure in their arm. This ratio provides valuable information about peripheral artery disease (PAD) and overall cardiovascular health. A healthy ABI value typically indicates adequate blood flow to the legs, while a lower value may suggest arterial blockage or narrowing that could lead to inadequate circulation.

In contrast, measuring muscle strength or joint flexibility would not be captured by the ABI, as it specifically focuses on blood flow rather than physical capabilities or range of motion. Therefore, the assessment of blood pressure in the ankle compared to the arm is a crucial indicator of vascular health and is integral in diagnosing conditions related to circulation.