There are three treatment phases:

1- Maturation of ovule (egg):
The treatment involves the combination of hormones, which are started on the first days of the cycle and maintained until one or more ovules reach correct maturity. The dose may vary from one patient to another and from one cycle to another.

2- Ovulation:
Once one or more eggs are fully mature, ovulation is triggered with the administration of a fixed dose of 500 IU of human chorionic gonadotropin (hCG) hormone. Ovulation usually occurs within 36 and 40 hours.

3- Preparation of the endometrium:
The endometrium is the inner lining of the uterus and this must be adequately prepared to allow proper implantation of the embryo. For this, two further doses of hCG are administered after ovulation, or natural progesterone may be administered via the vagina.


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