ABI Calculator (Ankle-Brachial Index)
Calculate ankle-brachial index for peripheral artery disease screening
Blood Pressure Measurements
Measure blood pressure in both arms and enter the higher value
Highest systolic pressure measured at the right ankle
Highest systolic pressure measured at the left ankle
Example Calculation
Patient Example
Highest arm pressure: 120 mmHg
Right ankle pressure: 110 mmHg
Left ankle pressure: 95 mmHg
Calculation
Right ABI = 110 ÷ 120 = 0.92 (Acceptable)
Left ABI = 95 ÷ 120 = 0.79 (Mild arterial disease)
Result: Right leg shows acceptable circulation, left leg shows mild arterial disease
ABI Interpretation Guide
Above 1.4
Calcification/Hardening
Consult vascular specialist
1.0 - 1.4
Normal
No action needed
0.9 - 1.0
Acceptable
No action needed
0.8 - 0.9
Mild Arterial Disease
Consult your doctor
0.5 - 0.8
Moderate Arterial Disease
Consult vascular specialist
Below 0.5
Severe Arterial Disease
Immediate medical attention
PAD Risk Factors
Diabetes
Increases arterial damage risk
Smoking
Major modifiable risk factor
High Blood Pressure
Damages artery walls
High Cholesterol
Causes plaque buildup
Age (50+)
Risk increases with age
Test Information
Performed by healthcare professionals
Non-invasive Doppler ultrasound
Quick 10-15 minute procedure
No smoking 2 hours before test
Understanding the Ankle-Brachial Index (ABI)
What is ABI?
The Ankle-Brachial Index (ABI) is a simple, non-invasive test used to diagnose peripheral artery disease (PAD). It compares blood pressure in your ankle with blood pressure in your arm to determine how well blood is flowing to your extremities.
How is it performed?
A healthcare professional uses a Doppler ultrasound device to measure systolic blood pressure at multiple points: both arms and both ankles. The highest reading from each location is used in the calculation.
When is ABI recommended?
- •Leg pain while walking (claudication)
- •Non-healing wounds on feet or legs
- •Cold feet or color changes in legs
- •Presence of cardiovascular risk factors
Clinical Significance
Early Detection
Identifies PAD before symptoms appear
Risk Assessment
Predicts cardiovascular event risk
Treatment Monitoring
Tracks response to interventions
Prognosis
Lower ABI indicates worse outcomes
Limitations
- • May be falsely elevated in diabetes (calcified arteries)
- • Cannot detect mild disease in some patients
- • Requires trained healthcare professional
- • May need additional tests for complete assessment
Important Medical Disclaimer
This ABI calculator is for educational purposes only and should not replace professional medical evaluation. The actual ABI test must be performed by qualified healthcare professionals using proper equipment.
Always consult with qualified healthcare professionals for:
- Proper ABI testing and measurement
- Clinical interpretation of results
- Diagnosis and treatment of peripheral artery disease
- Management of cardiovascular risk factors
Seek immediate medical attention if you experience: Severe leg pain, non-healing wounds, sudden color changes in extremities, or signs of acute arterial occlusion.