[Variation of growth hormone and prolactin levels in umbilical vein (author's transl)].
Umbilical venous blood, obtained immediately after the delivery of 71 non-complicated pregnants between 38 and 42 weeks of gestation, was investigated for the variation in growth hormone and prolactin levels in the serum. Growth hormone and prolactin levels remained almost constant during the observed period of the gestation. Further, it was shown that while growth hormone levels did not significantly vary through the 24-hour period, prolactin levels significantly did. In prolactin levels, the maximum value at 2 approximately 4AM was significantly about 2 times higher than the minimum value at 6 approximately 8 and 8 approximately 10AM. The levels did not vary through 2 approximately 4 and 10 approximately 12 PM period. These suggest that circadian periodicity exists in the fetal prolactin secretion, but not in the growth hormone, and in addition, the periodicity is not affected by labor and delivery.
D036861:Delivery, Obstetric; D005260:Female; D005312:Fetal Blood / Q000032:analysis*; D013006:Growth Hormone / Q000097:blood*; D006801:Humans; D011247:Pregnancy; D011388:Prolactin / Q000097:blood*; D014471:Umbilical Veins
D011388:Prolactin; D013006:Growth Hormone