When calculating ABI, which pressure should be used for the calculation?

The correct approach for calculating the Ankle-Brachial Index (ABI) involves using the highest ankle pressure recorded. This measurement is crucial because it provides the most accurate reflection of peripheral arterial flow. By using the highest ankle pressure, it ensures that the calculation represents the best possible perfusion status of the lower extremities.

In the context of the ABI calculation, the formula is:

ABI = Highest Ankle Pressure / Highest Brachial Pressure.

This method offers a reliable assessment of potential arterial insufficiency and is essential for diagnosing conditions such as peripheral artery disease (PAD). Utilizing the highest ankle pressure helps in identifying the most favorable blood flow in the arteries of the legs, which is vital for an accurate diagnosis.