Ankle Brachial Pressure Index Calculator
Ankle Pressures (mmHg)
Brachial Pressures (mmHg)
ABI Interpretation Guide
How to Use the Ankle Brachial Index Calculator
The Ankle Brachial Index Calculator is designed to help healthcare professionals assess peripheral artery disease risk by comparing systolic blood pressures between the ankles and arms. This non-invasive diagnostic method provides valuable insights into arterial health and cardiovascular risk. The calculator automatically determines the highest pressures from each limb and performs the necessary calculations to generate accurate ABI values with clinical interpretations.
To ensure accurate results, blood pressure measurements should be taken using appropriate Doppler ultrasound techniques or automated oscillometric devices. The patient should be in a supine position for at least 5-10 minutes before measurements to allow for proper circulation stabilization.
Step 1: Enter Ankle Pressure Measurements
Input the systolic blood pressure readings for both the dorsalis pedis and posterior tibial arteries in each ankle. You can enter values for one or both arteries per ankle. The calculator will automatically use the higher value from each ankle for the ABI calculation.
Step 2: Input Brachial Artery Pressures
Enter the systolic blood pressure measurements from both arms. The calculator will use the highest brachial pressure as the denominator for the ABI calculation, following standard clinical protocols to ensure accuracy and account for potential subclavian artery stenosis.
Step 3: Calculate and Review Results
Click the calculate button to generate ABI values for each ankle. The results will display the calculated ratios, the mathematical formula used, and clinical interpretations based on established medical guidelines. Each result includes color-coded classifications ranging from normal to severe peripheral artery disease.
Step 4: Interpret Clinical Significance
Review the interpretation guide provided below the calculator to understand the clinical significance of the ABI values. Normal values range from 1.00 to 1.40, while values below 0.90 typically indicate peripheral artery disease requiring further evaluation and potential intervention.