During this study we investigated 23 patients with preeclampsia and 23 women with normal pregnancies. The hemorheological, the hemostasiological and the dates of doppler ultrasound were evaluated. High values of D-Dimer as a sign for a rapidly turnover of fibrin, are a poor prognostical symptom for gestational hypertension. There is a close correlation between doppler ultrasound indices and the maternal D-Dimer. Nearly 80% of the new born babies with growth retardation suffered by a high blood viscosity of the umbilical artery. We postulate that the changes of maternal and fetal blood viscosity are very important to estimate the doppler flow velocity by patients with gestational hypertension.