In the present study, 6 out of 100 patients who had an attempted or actual external cephalic version (ECV) showed significant feto-maternal haemorrhage, the amount being greatest in patients with "failed" external versions. Thus ECV may be a source of rhesus iso-immunization in a rhesus negative mother with a rhesus positive fetus and should not be performed unless the father is rhesus negative. If, however, an ECV has been attempted, fetal cell counts should then be made and rhesus immunoprophylaxis administered if necessary.
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