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ABO and Rh phenotyping of foetal blood obtained by foetoscopy

Blood samples taken from the foetus by foetoscopy early in the 2nd trimester of pregnancy can be used for reliable blood grouping. However, the sampling technique is not perfect. In 5 out of 15 pregnant women, no foetal blood was obtained, although between 1 and 10 samples were taken on each occasion. One‐third of 56 samples from the 10 women contained foetal blood.