Ankle Brachial Index
|
ABI Value
|
Peripheral Artery Disease(PAD) severity | Recommendation |
| >1.4 | Noncompressible vessel. The vessel is either very healthy or severely calcified. Use ultrasound waveform for further differentiation. | If severely calcified, refer to vascular specialist |
|
1.0-1.4 |
Normal |
None |
|
0.9-1.0 |
Borderline |
None |
|
0.8-0.9 |
Mild PAD |
Treat risk factors |
|
0.5-0.8 |
Moderate PAD |
Refer to vascular specialist |
|
<0.5 |
Severe PAD |
Refer to vascular specialist |
Note: An ABI is calculated for each leg. The ABI value is determined by taking the higher pressure of the 2 arteries at the ankle, divided by the brachial arterial systolic pressure. In calculating the ABI, the higher of the two brachial systolic pressure measurements is used.