Abstract
A prospective study of 7065 consecutive new pregnancies identified 230 with a positive screen, of which 27% (62/230) were 'enzyme-only' antibodies. 32 of these (52%) were potentially clinically important and were all of Rh specificity: 22 anti-E, seven anti-Cw, two anti-D and one anti-c. However, only three of these enzyme-only antibodies (one anti-D, one anti-c and one anti-E) became reactive by the indirect antiglobulin test (IAT) during the course of pregnancy, and all were detected in the routine 34-36-week maternal sample. No babies were affected, and we reaffirm that routine antibody screening by enzyme techniques is unnecessary.
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