Ovulation disorders are a common cause of infertility in women. Most of these women can be classified as World Health Organization (WHO) Group II anovulatory patients as they have irregular or absent menstrual cycles but normal serum concentrations of follicle stimulation hormone (FSH) and estradiol.

The purpose of this study is to optimize the low-dose-step-up protocol traditionally used for ovulation induction with follicle-stimulating hormone (FSH) in women with anovulatory infertility WHO Group II.

Previous studies have established that menstrual cycle history, mean ovarian volume and BMI are significant predictors of FSH threshold dose in women with anovulatory infertility WHO Group II undergoing ovulation induction (Nyboe Andersen et al., 2008). A FSH dosage nomogram has been constructed based on these variables.

The aim of this study is to evaluate the clinical use of the nomogram in order to test the use of the variables to determine whether an individualized starting dose of FSH can be used for ovulation induction in anovulatory patients.

It is the hypothesis that an individualized starting dose of gonadotrophin will minimize the disadvantages of the treatment and that the stimulation period of the individualized nomogram-based treatment will be 25% shorter than observed in the standard protocol.

The primary endpoint is the proportion of patients who reach the criteria for hCG-administration within 14 days of Menopur stimulation. The results of the study will be compared with the data obtained in the Menopur Ovulation Induction Trial (Platteau et al., 2006).

Inclusion Criteria:

1. Anovulatory infertility
2. Age 18 - 39 years
3. Anovulation with oligomenorrhoea (> 35 days of mean cycle length) or amenorrhoea
4. Normal serum FSH (< 10 IU/l)
5. Two ovaries
6. BMI < 35
7. First FSH/HMG cycle at the Fertility clinic.
8. A sperm sample compatible with conception or semen from a donor.
9. Tubal patency documented by either hysterosalpingography (HSG) or hysterosalpingography by ultrasound (HSU) in cases where the woman has had a pelvic infection or pelvic surgery.

Exclusion Criteria:

1. A history of >12 ovulation induction cycles without achieving pregnancy.
2. More than three earlier gonadotropin cycles at other clinics or earlier treatments with threshold doses below 75.
3. Known hyperprolactinaemia or any other endocrine disturbance or systemic disease of the pituitary gland, thyroid gland, adrenal gland, pancreas, liver or kidney.
4. Undiagnosed vaginal bleeding.
5. Acute or chronic infection with HIV or hepatitis.
6. Persistent ovarian cysts or endometriomas detected by ultrasound.
7. Tumors of the hypothalamus, pituitary gland, breast, adrenal gland or ovary.
8. Pregnancy or lactation.
9. Current or past alcohol or drug abuse.
10. A history of chemo- or radiotherapy.
11. Malformations of reproductive organs incompatible with pregnancy.
12. Hypersensitivity to any trial medication.