What is the Ankle-Brachial Index (ABI)?
The Ankle-Brachial Index (ABI) is a simple, non-invasive test used to assess the risk of peripheral artery disease (PAD). It compares the blood pressure measured at the ankle with the blood pressure measured in the arm. The result helps identify blockages or narrowing in the arteries, which can indicate PAD.
The formula for calculating ABI is:
ABI = (Systolic Pressure at Ankle) ÷ (Systolic Pressure at Arm)
| Calculate ABI for Right Leg |
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| Calculate ABI for Left Leg |
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Results
| Parameter | Value |
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| Right ABI | - |
| Left ABI | - |
Why is ABI Important?
An ABI test is crucial for:
- Detecting early signs of PAD.
- Preventing complications such as ulcers, infections, or amputation.
- Monitoring vascular health in patients with diabetes, high cholesterol, or smoking history.
- Assessing overall cardiovascular risk.
How to Use an ABI Calculator
To use the ABI calculator, you need two measurements:
- Systolic blood pressure in the ankle.
- Systolic blood pressure in the arm.
Input these values into the calculator to determine the ABI ratio.
ABI values are interpreted as follows:
- 1.0 - 1.4: Normal.
- 0.9 - 0.99: Borderline PAD.
- Less than 0.9: Indicates PAD.
- Greater than 1.4: Suggests stiff arteries requiring further tests.
Example
Suppose the systolic pressure at the ankle is 120 mmHg, and the systolic pressure at the arm is 140 mmHg. The ABI would be:
ABI = 120 ÷ 140 = 0.86
This result indicates the presence of PAD.
Try Our Ankle-Brachial Index Calculator
Use our online ABI calculator to quickly and accurately assess your vascular health. It's easy to use and provides instant results.