The aim of this research was to study the parameters of fetal ultrasound imaging and Doppler ultrasound study in pregnant women with extragenital diseases (EGDs) during the treatment regimes with and without hyperbaric oxygen therapy (HBOT). Materials and Methods: A total of 235 pregnant women were examined prospectively at 5 to 40 weeks of gestation. The main group included 191 women with EGDs (anemia, arterial hypertension, chronic pyelonephritis); the control group included 44 women with physiological pregnancy without EGDs. Evaluation of treatment efficacy was based on data from clinical and laboratory findings before treatment and after its completion. The following hardware methods of research were performed: ultrasonography, fetometry, dopplerometric study of fetoplacental complex. Results: Based on data obtained from this study, the following findings were made: -In the early stages of gestation, there were no disturbances in fetoplacental blood circulation. -Starting the 19th week of pregnancy, there is a significant increase in the uterine artery resistive index in pregnant women with arterial hypertension. -In women with a high perinatal risk on the background of the studied EGDs, the third trimester of pregnancy, despite the ongoing conventional treatment, is characterized by persistent impairment in fetoplacental blood circulation. -The inclusion of HBOT in complex therapy in the early stages of pregnancy in women with a high perinatal risk allows leveling out the inevitable disturbances in fetoplacental blood circulation on the background of the studied EGDs.