Erythrophagocytosis++ test was performed in 45 pregnant Rh-negative women together with routine anti-Rh antibodies assay with indirect antiglobulin test and their concentration determined in an autoanalyser. It was found that the degree of ++phagocytosis of the standard erythrocytes immunized with maternal anti-Rh antibodies by the monocytes from healthy subjects is an important predictive factor enabling to foresee a severity of hemolytic disease in newborn babies. ++Phagocytosis over 50% predicts a severe course of the disease whereas under 20%--a mild form of the serologic conflict.

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