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Coagulation Profile in Severe Preeclampsia

From the Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas

Abstract

One hundred women with severe preeclampsia or chronic hypertension with superimposed preeclampsia were seen during a 2-year period. We sought to determine whether a normal platelet count assures that no other clinically significant clotting abnormalities are present, and what level of thrombocytopenia predicts a risk of abnormalities in other coagulation indices. Fifty women had platelet counts below 150,000/µL, of whom 13 had a fibrinogen level below 300 mg/dL and two had a prolonged prothrombin time (PT) or partial thromboplastin time (PTT). The admission platelet count was an excellent predictor of subsequent thrombocytopenia (r=0.829, P < .001). No subject had an abnormal fibrinogen level or prolonged PT or PTT in the absence of thrombocytopenia. When monitoring intrapartum coagulation indices in preeclampsia, one can safely follow only the platelet count at admission and subsequently, reserving PT and PTT and fibrinogen levels for those cases complicated by counts less than 100,000/µL.

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