What Is an Ankle-Brachial Index Test?
An ankle-brachial index assessment is a noninvasive way to analyze how your blood flows through your limbs. This simple exam analyzes the blood pressure in your arms and ankles and compares the two measurements. Specifically, your ABI result is the systolic blood pressure of your ankles divided by the blood pressure in your arms. A low ABI score signifies poor blood flow in your arms and legs.
Doctors commonly use the ABI test to check for peripheral arterial disease (PAD). PAD is a common circulatory condition in which plaque collects in your arteries, reducing blood flow to your limbs. Insufficient blood flow can cause serious complications and increase your risk of heart attack or stroke. Your doctor may recommend an ABI test if you’re at risk or show PAD symptoms. The ankle-brachial index can also help doctors check PAD’s severity or monitor its progression over time.