INTEGRIS Bennett Fertility



3433 NW 56th
Bldg. B, Suite 200
Oklahoma City, OK 73112

Embryo Freezing (Cryopreservation) in Oklahoma

Fertilized eggs (embryos) may be stored long-term in the frozen state. It allows couples undergoing IVF to have excess embryos stored for future pregnancy attempts without the expense and complexity of a fresh IVF cycle. The embryos are stored in special containers of liquid nitrogen in our IVF laboratory or at a long-term storage facility out of state. The length of freezing apparently does not affect the likelihood of pregnancy.


The most common indication for embryo freezing is to preserve and store excess embryos produced in IVF. In situations where fresh embryo transfer is not feasible (such as when the female partner becomes ill between egg retrieval and embryo transfer) or when pre-implantation genetic testing (which mandates embryo freezing after biopsy) is performed, a frozen embryo transfer is an alternative. In situations where the uterine lining may not be ready or receptive to embryos, freezing and doing a later transfer (“freeze all”) is also preferable.

Contraindications, complications, adverse effects

The freeze-thaw process may slightly reduce the likelihood of embryo survival. Most frozen embryos, however, survive the freezing and thawing process. The chance of pregnancy following frozen-thawed embryo transfer is similar (and in some cases better) than fresh transfer.   Poor quality embryos are unlikely to survive this process. There is no evidence for an increase in birth defects or chromosomal abnormalities as a result of the freeze-thaw process.