the mean plasma progesterone and 17-hydroxy-progesterone concentrations increased from 37.2 +/- 6.5 ( +/- se ) and 8.2 +/- 1.0 nmol/l , respectively , in early gestation to maximum levels of 138.0 +/- 25.7 and 22.8 +/- 2.2 nmol/l at week 38 ( p less than 0.01 ) .
C0033308
progesterone
C0020387
17-hydroxy-progesterone