Fetal hemoglobin for detection of fetomaternal hemorrhage is an accurate clinical diagnostic procedure for investigation of anemia in fetus and newborn.

In our laboratory, serologic RhD typing was safe. We detected all D variants and only missed DEL types. In assessing the immunization risk we included a DEL donor, found previous to this study, that did immunize a recipient with anti-D. We conclude that inadvertent immunization with D antigens in our setting was rare and in the order of 1.4 in 100,000 D- transfusions.

ABO-compatible fetal RBCs from an FMH had a life span in the maternal circulation close to that of adult RBCs.