Abstract
Summary and Conclusions
Agglutination tests with the heart's blood of 19 fetuses show that with ordinary technic, i. e., using sera and testing fluids with agglutinin titers of at least 1:8 and not too strong cell suspensions, agglutinations for A, B, M, N, and Rh can be obtained. This indicates that the agglutinogens are developed long before birth in sufficient strength for reliable examination.
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