[Thrombocytopenia during pregnancy].

Thrombocytopenia is the most frequent cause of acquired hemorrhagic diathesis. In addition to disorders that may cause thrombocytopenia in nonpregnant women, pregnant patients are at risk for the development of thrombocytopenia caused by syndromes such as preeclampsia, which are unique to pregnancy. In this review we discuss the major causes of thrombocytopenia that occur during pregnancy. These include the immune thrombocytopenic purpura, so called "gestational" thrombocytopenia, preeclampsia-associated thrombocytopenia, HELLP syndrome, thrombotic thrombocytopenic purpura and the hemolytic uremic syndrome.