How much increase of hematocrit level per 1 unit pf prbc?

A good rule of thumb is 1 Unit of PRBCs will raise an adult's Hgb by 1 g/dl or their Hct by 2~3%. For pediatrics, a 10 ml/kg transfusion will increase Hgb by 3 g/dl and Hct by 10% These are approximations, of course, and depend on the size of the patient, the exact Hct of the transfused blood, and red blood cell survival after transfusion. In general, a unit of PRBCs is ~300 ml and has a Hct of 70% Ref: "Clinical Anesthesiology," E. Morgan, M. Mikhail, M. Murray. 4th ed.