ABI consist of measuring the systolic BP with Doppler ultrasonography in each arm, dosalis pedis, posterior tibial pulses.
ABI calculated on both R and L by dividing the higher right ankle pressure by the higher right arm pressure and the higher left ankle pressure by the higher left arm pressure.
- 0.90-1.30 --> normal
- 0.41-0.90 --> mild to moderate PAD
- 0.00– 0.40 --> severe peripheral vascular disease w/ critical leg ischemia