to examine daily changes in blood hormone levels during the postpartum period , twenty steroids including free and conjugated pregnenolone ( p5 ) , 16 alpha oh-p5 ( 16p5 ) , dehydroepiandrosterone ( dha ) , 16 alpha oh-dha ( 16dha ) , estrone ( e1 ) , estradiol ( e2 ) , estriol ( e3 ) , estetrol ( e4 ) and free progesterone ( p4 ) , 16 alpha oh - p4 ( 16p4 ) , 20 alpha-dihydro-p4 ( 20p4 ) and cortisol ( f ) were measured simultaneously by ria .
C0014927
estriol
C0014899
estetrol