Doppler waves present hemodynamic state of vascular bed. This method is used in a diagnostic of pathological states in pregnancy. Basing on the observation of curve shape of uterine artery blood flow, we may conclude about its vascular resistance, wall tension and amount of blood. Several studies confirmed the opportunity of the use of Doppler uterine artery in a diagnosis and prognosis of complicated pregnancies. The incidence of notch in uterine artery blood flow was observed in pregnancies with incomplete trophoblast invasion and inadequate placentation. Many studies confirmed that bilateral notch might be associated with increased likelihood of different pregnancy complications, particularly pregnancy--induced hypertension (PIH) and intrauterine growth restriction (IUGR). The results of the most recent trials include the possibility of the use Ut-PI in a distinguishing of abnormal biochemical, prenatal tests in chromosomal aberrations and different pathological states in pregnancy such as preeclampsia and fetal hypotrophy.