in order to assess the periovulatory interrelationships between the plasma levels of estradiol , estrone , 17-hydroxyprogesterone , progesterone , cortisol and biologically active lutropin ( lh ) , peripheral blood samples withdrawn from 12 normally menstruating women at 07.00 , 15.00 and 23.00 h. during seven days of the midcycle period were analyzed .
C0020387
17-hydroxyprogesterone
C0033308
progesterone