Final answer:
Clomiphene citrate, Letrozole, GnRH agonists, and hMG are all methods used for ovulation induction in patients with a positive progestin challenge.
Step-by-step explanation:
Ovulation induction in patients with a positive progestin challenge can be achieved using several methods. Clomiphene citrate is often used to induce ovulation by stimulating the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Letrozole is another medication used to induce ovulation by inhibiting estrogen production. Gonadotropin-releasing hormone (GnRH) agonists can also be used to stimulate FSH and LH release. Additionally, Human menopausal gonadotropin (hMG) can be injected to stimulate ovarian activity. These different methods can be tailored to the specific needs of each patient.