Perinatal thrombocytopenia.

Maternal thrombocytopenia is common in normal pregnancies, but is a poor predictor of fetal thrombocytopenia even when the maternal thrombocytopenia is of pathologic etiology. The real risk to the fetus and the neonate is alloimmune thrombocytopenia, although identification of index cases is problematic and management of future pregnancies has not been defined.