Ankle/Brachial Index

The ABI is derived from (ankle systolic pressure) / (brachial systolic pressure)

 

It measures limb perfusion.

 

1.25 suspected arterial calcification

0.97 - 1.25 normal

0.75 - 0.96 mild ischemia

0.50 - 0.75 moderate ischemia

0.35 - 0.50 moderately severe ischemia

less than 0.35 severe ischemia

 

 

Stethescopes may be used, but Doppler is more sensitive.

 

ABI can provide indications of how much compression can be applied to a venous ulcer.

It can also demonstrate potential for arterial ulcer healing, as well as the necessity for surgery.