You're the best Dr. Kitson. Thank you so much! We've had some success measuring these four hormones in plasma using our lipidomics method, I needed something reliable to compare my numbers with.
In my opinion, the seminal papers on steroid hormone levels in women throughout the menstrual cycle are the following:
Guerrero R, Aso T, Brenner PF, Cekan Z, Landgren BM, Hagenfeldt K, Diczfalusy E. Studies on the pattern of circulating steroids in the normal menstrual cycle. I. Simultaneous assays of progesterone, pregnenolone, dehydroepiandrosterone, testosterone, dihydrotestosterone, androstenedione, oestradiol and oestrone. Acta Endocrinol (Copenh). 1976 Jan;81(1):133-49.
Aedo AR, Landgren BM, Cekan Z, Diczfalusy E. Studies on the pattern of circulating steroids in the normal menstrual cycle. 2. Levels of 20alpha-dihydroprogesterone, 17-hydroxy-progesterone and 17-hydroxypregnenolone and the assessment of their value for ovulation prediction. Acta Endocrinol (Copenh). 1976 Jul;82(3):600-16.