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Cryo Preservation

With good quality eggs and good sperm 85% of the eggs are usually fertilized. Normally with IVF only 1-2 embryos are replaced.

Any surplus embryos after the transfer depending on the quality are frozen (cryopreserved) in liquid nitrogen for future use. If you are successful with the initial treatment and have a pregnancy then you could use the cryopreserved embryos after the birth of the first baby. If you want to wait for two or more years until the baby has grown up we will keep the embryos safe till that time. Normally the embryos are kept frozen for no more than five years. A small charge is made for the safe keeping of your embryos. You should constantly keep in touch with the centre and pay your dues promptly; otherwise the embryos may not be kept any longer.

If however you were not successful after the initial treatment, you could have the cryopreserved embryos transferred after giving you a new schedule of hormones to develop the endometrium (lining of the uterus) or in a natural cycle after the ovulation is monitored. Only when the endometrial lining is sufficiently and satisfactorily developed, the embryos are replaced.

Cryopreservation is a very reliable method of utilizing the surplus embryos. The freeze / thaw success rate is 70-75%. Some embryos are naturally lost during freezing and thawing process. The results from our own previous experience in United Kingdom, Saudi Arabia and various other centres round the world suggest that freezing does not in any way damage the baby that is ultimately born. The pregnancy rate from frozen embryos is slightly lower than the fresh embryos at 25% if these are transferred. Very rarely all the embryos are lost during thawing process. We use a rapid freezing technique called vitrification of eggs and embryos. we have been using slow freezing technique for over 21 years with very good results. With vitrification we can get similar results.