Ovulation is a prerequisite for obtaining pregnancy. To accomplish this, a follicle containing the ovum is formed in the first days of the monthly cycle. In some cases, a hormonal stimulation of the ovaries is required because:
- There is a hormonal disorder which prevents ovulation
- A higher pregnancy rate can be obtained when more than one ovum is released in the Ovulation
To this end, either pills (e.g. Clomiphen) or injections (e.g. Puregon, Gonal-F or Menopur resp. Merional) can be used.