although specificity can not always be guaranteed for the smaller concentrations of androstenedione and cortisol , accuracy and reproducibility are excellent for the major progestagens and estrogens ( progesterone , 17- and 16 alpha-hydroxyprogesterone , pregnenolone , 20 alpha-dihydroprogesterone , estradiol and estrone ) .
C0033308
progesterone
C0012311
20