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 |
References
- 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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