Toe Pressure Measurement Guidelines

Primary Indication: Noncompressible Arteries

• When ABI >1.40, toe pressure with waveforms must be obtained because medial arterial calcification makes ankle arteries stiff and resistant to compression, artificially elevating pressure readings and masking true peripheral arterial disease (PAD), as recommended by the American College of Cardiology with a Class I recommendation and B-level evidence 1, 2
• The American College of Cardiology recommends toe pressure measurement when ABI is >1.40, indicating arterial calcification that renders the ABI unreliable, with a Class I recommendation and B-level evidence 1

High-Risk Populations Where Toe Pressure Should Be Strongly Considered

Diabetes Mellitus

• The International Working Group on the Diabetic Foot (IWGDF) guidelines recommend toe-brachial index ≥0.75 as a reliable test to exclude PAD in diabetic patients, whereas ABI may be falsely elevated or "falsely normalized" even when <1.40 3
• A TBI <0.70 is considered abnormal and indicates PAD, providing more accurate assessment than ABI in diabetic patients 2

Chronic Limb-Threatening Ischemia (CLTI)

• In patients with suspected CLTI, toe pressure/TBI with waveforms should be used in addition to ABI to assess arterial perfusion and establish the diagnosis, as recommended by the American College of Cardiology with a Class IIa recommendation 1
• Toe pressure <30 mmHg is a hemodynamic criterion for CLTI and should prompt urgent vascular imaging and revascularization consideration, as recommended by the American College of Cardiology and the European Heart Journal 1, 2

Chronic Kidney Disease/End-Stage Renal Disease

• These patients have high rates of arterial calcification similar to diabetes, making ABI unreliable and toe pressure the preferred measurement, according to the European Heart Journal 2

Clinical Scenarios Requiring Toe Pressure Assessment

When ABI is Normal but Clinical Suspicion Remains High

• If a patient has symptoms suggestive of PAD but ABI is 0.91-1.40, consider that arterial calcification may be "normalizing" a truly abnormal value, as noted in the Diabetes/Metabolism Research and Reviews 3

Wound Healing Assessment

• Toe pressure ≥30 mmHg predicts wound healing potential, while values <30 mmHg suggest need for revascularization before wounds will heal, as recommended by the American College of Cardiology and the Diabetes/Metabolism Research and Reviews 1, 3
• Skin perfusion pressure ≥40 mmHg and toe pressure ≥30 mmHg are the most useful bedside tests for predicting ulcer healing in diabetic foot ulcers, according to the Diabetes/Metabolism Research and Reviews 3

Interpretation Thresholds

• Normal TBI: ≥0.70 (some sources use ≥0.75 for diabetic patients), as recommended by the International Working Group on the Diabetic Foot (IWGDF) and the European Heart Journal 3, 2
• Abnormal TBI: <0.70, indicating PAD, as recommended by the European Heart Journal 2
• Critical ischemia threshold: Toe pressure <30 mmHg, requiring urgent vascular evaluation, as recommended by the American College of Cardiology and the European Heart Journal 1, 2
• Wound healing threshold: Toe pressure ≥30 mmHg suggests reasonable healing potential, as noted in the Diabetes/Metabolism Research and Reviews 3