Fetal blood group studies during mid‐trimester pregnancy and the management of severe isoimmunization

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Abstract
Fetal blood samples collected at 14–22 weeks' gestation by fetoscopy have been analysed for 25 different red cell antigens and anti‐A antibodies. The results obtained demonstrate that the technique can be used to determine fetal blood groups during mid‐pregnancy and also to provide the opportunity to study the physiological and pathological developments of blood groups and their antibodies and to manage more rationally those pregnancies threatened by erythroblastosis fetalis.