The mean prothrombin time of patients with gestational hypertension was 16.6 s, mild preeclampsia patients was 17.6 s and severe preeclampsia patients was 18.8 s 57.1% of cases with gestational hypertension, 83.3% of cases with preeclampsia and 100% cases of eclampsia showed prolonged prothrombin time. The gene discussed is F2; the disease is preeclampsia.