[Comparison of prolactin levels in first, second and multiple physiological pregnancy].

Serum prolactin level was estimated by radioimmunological method (RIA) in women during the first, the second and the multiple normal pregnancy. The value of prolactin was compared in the successive pregnancies and in the successive weeks of pregnancy. The dependence between concentration of prolactin and successive pregnancy was observed. A significant increase of prolactin was noted in the 4 week of multiple pregnancy. The increased level of prolactin was observed in the 10th, 12th, 14th, 40th and 42nd weeks of the first normal pregnancy.