- Evidence of adequate perfusion by one of the following on the affected extremity,(within the past 60 days):Dorsum transcutaneous oxygen test (TcPO2) with results of ≥30 mmHg, or ABIs with results of ≥0.7 and ≤1.2 and toe pressures with results of ≥30 mmHg, or Doppler arterial waveforms, which are triphasic or biphasic at the ankle in the affected leg.