Figure 33-2

Figure 33-2.

Serum levels (in mIU/mL) of follicle-stimulating hormone (FSH) and
luteinizing hormone (LH) during the menstrual cycle, with and without
oral contraception. A: During a normal cycle without medication. B: During atypical cycle with combined medication (see text). C: During a typical cycle with sequential medication (see text). D: During progestin-only medication. (Reproduced, with permission, from Odell WD, Moyer DL: Physiology of Reproduction. Mosby, 1971.)