to study the changes in circulating steroid levels during pregnancy , ten steroids which included progesterone ( p4 ) , 16 alpha oh-progesterone ( 16p4 ) , free and conjugated pregnenolone ( p5 ) , 16 alpha oh-pregnenolone ( 16p5 ) , dehydroepiandrosterone ( dha ) and 16 alpha oh-dehydroepiandrosterone ( 16dha ) were measured simultaneously by ria in 84 normal pregnant women from the 5th to 41st week of gestation .
C0032961
pregnancy
C0033308
progesterone