Ankle-Brachial Index Calculator
Calculate the Ankle-Brachial Index (ABI) to screen for peripheral artery disease (PAD).
Input Parameters
Enter details for calculation.
Ankle-Brachial Index
Expert Tip
ABI ≤ 0.90 is diagnostic of peripheral artery disease (PAD). ABI > 1.40 indicates calcified, non-compressible arteries.
Calculation Methodology & Details
Formula
Compares the systolic blood pressure at the ankle with that of the arm.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
How ABI is Calculated
Follow these steps to use this calculator:
Measure Pressures
Use Doppler to record systolic pressures at arm and ankle.
Calculate Index
Divide ankle pressure by brachial pressure.
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ℹ️ About this Calculation
This clinical cardiovascular calculator provides precise hemodynamics assessment, ischemic heart disease risk stratification, electrophysiology calculations, and vascular disease evaluation based on ACC/AHA guidelines.
Variable Glossary
Vascular & ECG Data
Systolic/diastolic blood pressure, pulse rate, ECG intervals (QT/RR), or ankle-brachial Doppler pressures.
Hemodynamic Scores
Mean arterial pressure (MAP), corrected QTc interval, ASCVD 10-year risk percentage, or ejection fraction.
How to Calculate Step-by-Step
Step 1
Input hemodynamic vitals, lab values, or ECG measurement parameters.
Step 2
Select patient demographics, clinical comorbidities, or exercise test responses.
Step 3
Review calculated risk scores, hemodynamic parameters, and clinical classification recommendations.