Plasma 1,25-dihydroxyvitamin D levels in pregnancy and lactation

Plasma concentrations of 1,25-dihydroxyvitamin D (1,25--(OH)2D), serum prolactin and serum parathyroid hormone (PTH) were followed during pregnancy and lactation in 16 women. High 1,25--(OH)2D was demonstrated in human pregnancy and lactation. A causative relationship between 1,25--(OH)2D and prolactin is discussed and a possible explanation of the mechanism of the augmented calcium absorption in human pregnancy and lactation is suggested.