*5.1.2 Toe pressures*

Toe pressure and toe arm pressure index (TBI) may be a more useful measure of perfusion due to the characteristic sparing of the foot arteries from vascular disease in diabetics [30]. Toe pressure can be effectively measured using photoplethysmography (which detects pulsating flow to generate pulse wave waveforms) or laser Doppler (which detects wavelength changes when a laser hits blood cells).
