Final answer:
The Ankle Brachial Index (ABI) is a test used to evaluate peripheral arterial disease (PAD) by comparing blood pressure measurements in the ankle and upper arm. A lower ABI indicates a higher risk of PAD and poor blood flow to the legs.
Step-by-step explanation:
The Ankle Brachial Index (ABI) is a quick, non-invasive test used to evaluate peripheral arterial disease (PAD). It measures the blood pressure in the ankle and compares it to the blood pressure in the upper arm.
The ABI is important in diagnosing PAD because in this condition, the blood pressure at the ankle is typically lower than the blood pressure at the upper arm. A lower ABI value indicates a higher risk of PAD and poor blood flow to the legs.
This test is often performed using a blood pressure cuff and a Doppler ultrasound device to measure the blood pressure in the ankle and arm.