Hematology

Blood Component Transfusion Volume & Post-Transfusion Increment Calculator

Calculates required volume and expected laboratory rise for PRBCs, Platelets, FFP, and Cryoprecipitate.

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Parameters

Blood Component Transfusion Volume & Post-Transfusion Increment Calculator Result

Formula

Adult PRBC: 1 Unit raises Hgb by ~1.0 g/dL (Hct +3%)
Pediatric PRBC: Volume (mL) = Weight (kg) × ΔHgb (g/dL) × 4
Platelets: 1 Apheresis unit raises count by 30,000–50,000/μL
FFP: 10–15 mL/kg (raises factor levels by 20–30%)
Cryoprecipitate: 1 pool (10 units) raises fibrinogen by 50–70 mg/dL

Clinical Pearls

Ensures guideline-adherent blood management, curtailing unnecessary transfusions and preventing transfusion reactions while rapidly stabilizing hemorrhagic shock.

Limitations

Calculations assume normal in vivo recovery; ongoing active bleeding, splenomegaly, or HLA alloimmunization will decrease post-transfusion increments.