A patient may have multiple high quality embryos eligible for embryo transfer back to the uterus. A certain number of embryos are chosen for embryo transfer, and the surplus of high quality embryos are able to be cryopreserved for future use. Previously, embryos were cryopreserved using a slow freeze method. Vitrification is a new process for cryopreserving embryos.
Through vetrification, the water molecules in an embryo are removed and replaced with a higher concentration of cryoprotectant than in the slow freeze method. This quick freezing reduces the chance for intercellular ice crystals to be formed, thus decreasing the degeneration of cells upon thawing for embryo transfer.
Embryos are frozen in cryolock system . each straw is labeled properly including the quality and no. of embryos.
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