Ankle-Brachial Index

Helpful in diagnosis of peripheral arterial disease

Also, decreased ABI associated with high-risk CAD, stroke, TIA, renal insufficiency and all-cause mortality.

Normal:  0.9 – 1.3

> 1.3 = calcified, sclerotic vessels

< 0.9 if occlusive arterial disease (95% sens, 100% spec)

< 0.4 suggestive of multilevel disease (iliac, femoral, tibial) and associated with non-healing ulcers and gangrene

For diabetics, a toe-brachial index is preferred because of sparing from calcification

  • TBI 0.7-0.8 is normal range.
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