Table 1.

Categories of capillary flow velocities.

Blood flow category	Description of blood flow
0	No flow: Visible erythrocytes, no movement
1	Sluggish flow: Intermittent slow flow
2	Slow flow: Continuous slow flow or Intermittent “no flow” and rapid flow
3	Continuous flow
4	Rapid flow: Continuous rapid flow or Intermittent slow and brisk flow
5	Brisk flow: Continuous brisk flow
6	Uncertain: Velocity impossible to determinate