In this study, the association of high homocysteine concentrations (>10 μmol/L) of pregnant women with hypertensive disorders during pregnancy was studied, as well as other complications of pregnancy, such as loss of pregnancy in the first half, premature birth, intrauterine growth retardation, congenital malformations development of the fetus. A single-center prospective cohort study was conducted. Depending on the concentration of homocysteine detected by the immunoenzyme assay with monoclonal antibodies Homocysteine EIA ELISA (Axis-Shield Diagnostics Ltd, Scotland), for a period of up to 14 weeks, the subjects were divided into 2 groups: with high concentrations (>10 μmol/L) and normal levels (<10 μmol/L). We controlled complications of pregnancy: loss of pregnancy in the first half, premature birth, delayed fetal growth, congenital malformations of the fetus, gestational hypertension, mild and severe preeclampsia, eclampsia and HELLP syndrome. The results of the study showed that at a level of homocysteine I trimester >10 μmol/l spontaneous abortion, premature birth, gestational hypertension, mild preeclampsia develop more often. There were no differences in the groups for delaying intrauterine growth of the fetus, congenital malformations, severe preeclampsia.