How embryo freezing differs from egg freezing
Embryo freezing preserves embryos — eggs that have already been fertilized with sperm in the lab. Because fertilization has already occurred, some questions about future family building (partner or donor sperm, use of preimplantation genetic testing) are decided at the time of embryo creation rather than later.
When it is considered
Embryo freezing is typically part of an IVF cycle. Any embryos not transferred fresh can be frozen for future transfers. It is also chosen electively by couples, single parents planning ahead, and patients preserving fertility before medical treatment.
Genetic testing considerations
PGT can be performed on embryos before freezing. Whether to test, and which type of testing to use, depends on age, history, and goals.
Consent and future use
Embryos are patient property under clear consent that names how they may be used, transferred, donated, or disposed. Where partners or donors are involved, consents make roles explicit up front. Discuss your specific situation with your physician and, when appropriate, independent legal counsel.
Storage and transfers over time
Frozen embryos remain viable in long-term storage. Frozen embryo transfers (FET) are scheduled around a prepared or natural cycle and, in many practices, are the default over fresh transfer for select clinical situations. Your physician will explain which pathway fits your plan.