The normal platelet count in pregnancy is 150–400 × 109/L, and thrombocytopenia is defined as platelet count below 150 × 109/L. Platelets are responsible for primary hemostasis, plugging sites of endothelial damage and acting as a surface for secondary hemostasis via the coagulation pathway. According to the National Health and Nutrition Examination Survey (NHANES) the platelet count in the first trimester were significantly lower than platelet count in nonpregnant women.