The authors compared the blood pressure (BP) values obtained by 24-hour blood pressure monitoring at 24-37 weeks gestational age with the outcomes for the fetus and neonate in 460 patients with arterial hypertension of different genesis. A fair outcome (healthy baby birth) was noted in 319 women (Group 1), a poor outcome (severe neonatal status, ante- and postnatal death) was in 141 (Group 2). In Group 1, BP levels were significantly lower than in Group 2. It is proposed to use the findings to define indications for the start of systematic antihypertensive therapy in pregnant women (the mean 24-hour BP was more than 126/76 mm Hg). When systematic antihypertensive therapy is performed, the target BP levels for pregnant women should be lower than these values.