Table 1.

Colour-Doppler for a semi-quantitative evaluation of intra-renal vascularization [4]

Stage	Quality of renal perfusion by colour-Doppler
0	Unidentifiable vessels
1	Few vessels in the vicinity of the hilum
2	Hilar and interlobar vessels in most of the renal parenchyma
3	Renal vessels identifiable until the arcuate arteries in the entire field of view

Bedside Doppler Ultrasound for the assessment of renal perfusion in the ICU: advantages and limitations of the available techniques. David SCHNELL et al.