1. What is the Ankle Brachial Index?

The Ankle Brachial Index (ABI) is a simple, non-invasive test used to assess peripheral arterial disease (PAD). It compares the blood pressure in the ankle with the blood pressure in the arm to determine how well blood is flowing in the limbs.

2. How Does the Calculator Work?

The calculator uses the ABI formula:

Where:

• Ankle Pressure — Highest systolic pressure from either ankle (mmHg)
• Brachial Pressure — Highest systolic pressure from either arm (mmHg)

Explanation: The ratio compares the blood pressure in the lower extremities to that in the upper extremities, with lower values indicating reduced blood flow to the legs.

3. Importance of ABI Measurement

Details: ABI is a key diagnostic tool for peripheral arterial disease. It helps identify patients at risk for cardiovascular events and guides treatment decisions.

4. Using the Calculator

Tips: Enter the highest systolic pressure from either ankle and the highest systolic pressure from either arm. Both values must be greater than 0 mmHg.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal ABI range?
A: Normal ABI ranges from 1.0 to 1.4. Values below 0.9 suggest PAD, while values above 1.4 may indicate non-compressible arteries.

Q2: How should blood pressures be measured for ABI?
A: Measure systolic pressures in both arms and both ankles using a Doppler probe and blood pressure cuff.

Q3: Who should get an ABI test?
A: Adults with leg pain when walking, non-healing leg wounds, or risk factors for PAD (smoking, diabetes, hypertension, high cholesterol).

Q4: Can ABI be used for follow-up?
A: Yes, ABI can monitor disease progression and treatment effectiveness in PAD patients.

Q5: What if ABI is greater than 1.4?
A: This suggests calcified, non-compressible arteries. Additional tests like toe-brachial index may be needed.