What embryo freezing is
After fertilisation and culture, embryos that meet laboratory criteria may be frozen. Freezing does not change the need for careful medical judgement about if and when to transfer.
Why embryos are frozen
Embryos may be frozen to enable a later frozen embryo transfer, to reduce the chance of ovarian hyperstimulation in some cycles, or when genetic testing of embryos is planned before transfer. Reasons are individual.
Frozen embryo transfer and future use
In a frozen embryo transfer (FET), the uterus is prepared, a stored embryo is thawed, and transfer is timed. Not every embryo survives thaw. Remaining embryos stay in storage according to consent and applicable rules.
Frequently asked questions
Are frozen embryos less successful than fresh transfer?
Both fresh and frozen transfers are used in fertility care. Your specialist will explain which approach may suit your cycle. Outcomes vary.
How long can embryos be stored?
Storage follows medical practice, laboratory policy, and regulation. This is explained as part of consent before freezing.
This page is for patient education and does not replace a personal medical consultation. Treatment choices and outcomes vary. Your fertility specialist will advise based on your history, examination, and test results. No fertility treatment can guarantee pregnancy.