Ankle Brachial Index Calculator

Ankle Brachial Index (ABI) Calculator can be used to assess peripheral artery disease (PAD) by comparing blood pressure in the ankle and arm. ABI is calculated as the ratio of ankle systolic blood pressure to brachial systolic blood pressure.

Input Parameters

Calculation Results

Calculation Formula

ABI = (Ankle Systolic Pressure + Ankle Diastolic Pressure) / (Brachial Systolic Pressure + Brachial Diastolic Pressure)

Where:
Ankle Systolic Pressure = Ankle Systolic Blood Pressure (Left Ankle)
Ankle Diastolic Pressure = Ankle Diastolic Blood Pressure (Left Ankle)
Brachial Systolic Pressure = Brachial Systolic Blood Pressure
Brachial Diastolic Pressure = Brachial Diastolic Blood Pressure

ABI Result

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Interpretation

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Ankle Brachial Index Calculator Calculator Usage Guide

Learn how to use the Ankle Brachial Index Calculator calculator and its working principles

How to Use the Calculator

  1. Enter the brachial systolic and diastolic blood pressures in the respective fields.
  2. Enter the ankle systolic and diastolic blood pressures in the respective fields.
  3. Click the "Calculate" button to compute the Ankle Brachial Index (ABI).
  4. The result will be displayed along with an interpretation based on the calculated ABI value.

Understanding the Results

The Ankle Brachial Index (ABI) is a simple, non-invasive test that helps in the diagnosis of peripheral artery disease (PAD). The ABI is calculated by dividing the ankle systolic blood pressure by the brachial systolic blood pressure.

Interpretation of ABI Values:

  • Normal ABI: 0.91 to 1.4
  • Mild PAD: 1.41 to 1.90
  • Moderate PAD: 1.91 to 2.40
  • Severe PAD: >2.40
  • Borderline: <0.91

Principle of ABI Calculation

The ABI reflects the ratio of blood pressure in the ankle to that in the arm. A reduced ABI suggests poor blood flow to the legs, which may indicate the presence of peripheral artery disease. It is important to note that factors such as smoking, diabetes, and high blood pressure can affect ABI results.