Final answer:
A normal Ankle-Brachial Index (ABI) ranges from 1.0 to 1.4. An ABI between 0.4 and 0.9 indicates claudication, and an ABI lower than 0.4 suggests rest pain or tissue loss associated with severe peripheral arterial disease (PAD).
Step-by-step explanation:
Ankle-Brachial Index (ABI) is a diagnostic test used to determine the presence of peripheral arterial disease (PAD), a condition where the arteries in the legs are narrowed or blocked, affecting blood flow. A normal ABI range is between 1.0 and 1.4. An ABI that indicates claudication, which is pain in the legs that occurs with walking and goes away with rest, typically falls between 0.4 and 0.9. An ABI lower than 0.4 typically indicates more severe PAD, such as rest pain or tissue loss.