Ovulation induction (OI) is a very common treatment for women who are diagnosed with ovulation disorders like for example Polycystic Ovarian Syndrome (PCOS) and Hypogonadotrophic Hypogonadism (HH). OI is achieved either with hormonal tablets (Clomiphene Citrate and Letrozole) or with injectable hormones (Follicle Stimulating Hormone). OI can be undertaken while attempting natural conception with intercourse or with intra-uterine insemination (IUI) if frozen or donor sperm is used.

Medication tablets or injectables are usually started on the second or third day of the cycle. A transvaginal ultrasound scan is performed around day 7 to 10 of the cycle to assess follicular growth and establish the right time of intercourse or IUI. Additional days of treatment may be required to achieve ovulation, according to the indication and cause of subfertility.