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Fetal hemoglobin, hemoglobin F, acid elution slide test.
To assist in assessing occurrence and extent of fetal maternal hemorrhage and calculate the amount of Rh immune globulin to be administered.
Whole blood collected in a lavender-top (EDTA) tube. Freshly prepared blood smears are also acceptable. Cord blood may be requested for use as a positive control.
(Method: Microscopic examination of treated and stained peripheral blood smear) Less than 1% fetal cells present.