Cryopreservation of embryos

Couples, who are concerned about the risk of HIV from egg donor, should consider having all the fertilized eggs frozen. After 6 months, the egg donor can be re-tested for HIV and if she is still negative, the frozen embryos can then be thawed and transferred to the recipient's uterus.

If for some reason, the recipient's cycle can not be synchronized with that of the donor, then the donated eggs will be inseminated with the recipient's male partner sperm, and freeze all suitable embryos for later transfer.

In some countries such as France, all the resulting embryos from donated eggs, should be frozen and quarantined for six months and replaced only after the donor has had a second negative screening for HIV, Hepatitis B and C and cytomegalovirus.

Because of shortage of egg donors, many egg donation programs involves sharing the donated eggs between two recipients.

Frozen embryo transfer can be performed either in a natural monitored cycle or a hormone replacement cycle. Natural cycle is only suitable for young women with regular menstrual cycles and regular ovulation.

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