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Huntington Reproductive Center - Blogs

The HRC Fertility Blog is a resource for patients and those seeking infertility related issues and articles. Check back often or subscribe to this blog as it is changed weekly by the HRC staff.

Fresh Versus Frozen IVF Cycles

FET

For more than 30 years, frozen embryo transfers (FETs) have been successfully utilized when patients have had excess frozen embryos remaining from a fresh cycle. But with older freezing methods, success rates were not as impressive. In recent years, however, several studies have demonstrated the increasing effectiveness of frozen IVF cycles. In fact, most IVF centers are now conducting more frozen cycles for certain types of patients, making FETs the first line of treatment for many.

Factors Improving FET Success Rates

There are several reasons for the improved success. First, embryologists are now freezing embryos through vitrification, a rapid form of cryopreservation. Because of vitrification, more embryos are surviving the thawing process. Second, many experts feel frozen cycles more closely mirror a natural uterine environment since a woman's hormone levels return to normal after being stimulated for an egg retrieval.

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