Transfusion coefficient for calculating transfusion volume for fetal transfusion

Target hematocrit minus beginning hematocrit = Desired increment in hematocrit	Transfusion coefficient
10	0.02
15	0.03
20	0.04
25	0.05
30	0.06

Transfusion_coefficient.htm

As an example, to increase the hematocrit of a 1000 gram fetus from 20 percent to 40 percent, one multiplies 0.04 (coefficient for raising the hematocrit by 20) and 1000 (the estimated fetal weight in grams) to yield 40 mL (the volume that needs to be transfused).

Data from: Moise KJ, Whitecar PW. Antenatal therapy for hemolytic disease. In: Alloimmune Disorders of Pregnancy. Anemia, thrombocytopenia and neutropenia in the fetus and newborn. Hadley A, Soothill P (Eds), Cambridge University Press, Cambridge, UK 2002. p.182.

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Transfusion coefficient for calculating transfusion volume for fetal transfusion