Prevention of rhesus immunization. A controlled clinical trial with a comparatively low dose of anti-D immunoglobulin.

A controlled clinical trial was carried out to test the effectiveness of a comparatively low dose of anti-D immunoglobulin (250 mug) in preventing rhesus immunization.In the control group 17 out of 329 women (5%) formed rhesus antibodies, whereas in the treated group only 3 out of 333 women (0.9%) showed active immunization, all three of whom had an exceptionally large transplacental bleeding.