Rapid detection of Rh(D)‐ or K‐positive fetal red cells in chorion villus samples by a flow cytometric technique

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Abstract
Rh(D)- and K-negative women who have become severely isoimmunized by pregnancy are at risk of fetal loss or damage in subsequent pregnancies. A flow cytometric method is described whereby the presence of Rh(D) or K antigen on fetal erythrocytes may be determined using chorion villus samples taken during the first trimester. This method has the advantage of speed and sensitivity with results being available within 2 h. Decisions as to management of the pregnancy or termination may thus be made with minimal delay.