Ankle-Brachial Index (ABI) Calculator
Calculate ABI to assess peripheral artery disease risk using ankle and arm systolic pressures.
How to use
Enter ankle and arm systolic pressures. The calculator outputs the ABI value and a basic risk interpretation.
Methodology
All calculations are strictly based on the guidelines provided by the American Heart Association. See the citation link for the primary reference.
Glossary of Variables
- Ankle Systolic Pressure: The blood pressure measured at the ankle.
- Arm Systolic Pressure: The blood pressure measured at the arm.
- ABI Value: The calculated index used to assess peripheral artery disease risk.
How It Works: A Step-by-Step Example
Suppose the ankle systolic pressure is 110 mmHg and the arm systolic pressure is 120 mmHg. The ABI is calculated as follows:
ABI = 110 / 120 = 0.92
An ABI value of 0.92 indicates a mild risk for peripheral artery disease.
Frequently Asked Questions (FAQ)
What is the Ankle-Brachial Index (ABI)?
The ABI is a simple test that compares the blood pressure in your ankle with the blood pressure in your arm to assess the risk of peripheral artery disease.
Why is ABI important?
ABI is important as it helps detect peripheral artery disease which could lead to serious complications if left untreated.
What is a normal ABI value?
A normal ABI value ranges from 1.0 to 1.4. Values below 1.0 may indicate blocked arteries.
Can ABI be used for diagnosis?
ABI is a screening tool and should be used in conjunction with other assessments and clinical evaluations for diagnosis.
Is the test painful?
No, the ABI test is non-invasive and painless, involving only blood pressure measurements.
Full original guide (expanded)
The ABI formula used is provided in the formulas section below.