1. What is the Ankle-Brachial Index (ABI)?

The Ankle-Brachial Index (ABI) is a simple, non-invasive test used to screen for peripheral artery disease (PAD). It compares the blood pressure in the ankle with the blood pressure in the arm to assess blood flow to the legs.

2. How Does the Calculator Work?

The calculator uses the ABI formula:

Where:

• Lowest Ankle Pressure — The lower of the two systolic pressures measured at the ankles
• Highest Arm Pressure — The higher of the two systolic pressures measured at the arms

Explanation: The ABI calculation helps identify reduced blood flow to the legs, which may indicate peripheral artery disease.

3. Importance of ABI Calculation

Details: ABI is a valuable screening tool for peripheral artery disease, which can lead to serious complications if left untreated. Early detection allows for timely intervention and management.

4. Using the Calculator

Tips: Enter the lowest ankle pressure and highest arm pressure in mmHg. Both values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

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

Q2: How is ABI measured clinically?
A: ABI is measured using a blood pressure cuff and a Doppler ultrasound device to detect blood flow in the arteries of the arms and ankles.

Q3: Who should get an ABI test?
A: Individuals with risk factors for PAD, such as smoking, diabetes, high blood pressure, high cholesterol, or a family history of vascular disease.

Q4: Can ABI be used for diagnosis?
A: While ABI is an excellent screening tool, abnormal results should be confirmed with additional tests such as ultrasound, CT angiography, or conventional angiography.

Q5: Are there limitations to ABI measurement?
A: ABI may be less accurate in patients with diabetes, renal disease, or very calcified arteries that are difficult to compress.