Registered Phlebology Sonographer (RPhS) Certification Practice Test 2026 – All-in-One Solution to Master Your Certification!

Question: 1 / 600

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

The average of both ankle pressures

The lowest ankle pressure recorded

The highest ankle pressure recorded

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.

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The mean brachial pressure

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