The purpose of the present study is to analyse prospectively if highly purified hMG compared with increased dose of clomiphene citrate has different outcomes in folliculogenesis in ovulation induction cycles.

Inclusion Criteria:

• < 39 years old on day of randomisation
• FSH < 12 (in the early follicular phase)
• Normal ultrasound scan, i.e. presence of both ovaries, without evidence of abnormality within 6 months prior to randomisation.
• Chronic oligo or anovulation (WHO 2)
• BMI between 18 and 31 (both inclusive)

Exclusion Criteria:

• ≥ 39 years old on day of randomisation