WHO bleeding scale

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The World Health Organization, or WHO, made a standardized grading scale to measure the severity of bleeding.

Grade 0= no bleeding; Grade 1=petechial bleeding; Grade 2=mild blood loss (clinically significant); Grade 3=gross blood loss, requires transfusion(severe; Grade 4= debilitating blood loss, retinal or cerebral associated with fatality

Reference: Webert KE, Cook RJ, Sigouin CS, et al. The risk of bleeding in thrombocytopenic patients with acute myeloid leukemia. haematologica 2006;91:1530-1537

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