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Frozen Embryo Transfer (FET) in IVF
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What Is Embryo Implantation in IVF?
Embryo implantation is a crucial step in in vitro fertilization (IVF), where a developed embryo is transferred into the uterus to achieve pregnancy. One of the most commonly used methods today is Frozen Embryo Transfer (FET).
What Is Frozen Embryo Transfer (FET)?
Frozen Embryo Transfer (FET) involves thawing embryos that were previously cryopreserved during an earlier IVF cycle and transferring them into the uterus.
This approach eliminates the need for repeated ovarian stimulation and egg retrieval, reducing physical burden and improving flexibility in treatment timing.
When Is FET Recommended?
FET is commonly recommended in the following situations:
- Surplus high-quality embryos from a previous IVF cycle
- Embryos undergoing genetic testing (PGT-A / PGS)
- Suboptimal uterine environment (e.g., thin endometrium)
- Prevention of ovarian hyperstimulation syndrome (OHSS)
- Delayed pregnancy planning
FET Process Step by Step
Step 1: Endometrial Preparation (Cycle Day 2–3)
Hormonal medications are used to prepare the uterine lining.
Step 2: Endometrial Evaluation (Day 11–12)
Ultrasound and blood tests confirm whether the uterus is ready.
Step 3: Embryo Transfer (Day 14–20)
The thawed embryo is transferred into the uterus based on embryo development stage.
Embryo Storage and Usage Regulations
- Embryos can be stored for up to 10 years
- Storage extension requires written consent
- Embryos must be discarded if the couple divorces or one partner passes away
- Limited to 4 embryos per procedure
Frequently Asked Questions About FET
Does freezing embryos affect baby health?
Current research shows no significant difference in health outcomes compared to natural conception.
Does FET affect success rates?
With modern vitrification technology, embryo survival rates are high, and pregnancy rates may even be higher than fresh embryo transfer.
Are there risks for children born from frozen embryos?
No, there is no evidence of long-term risk to children born from frozen embryos.
Does freezing embryos affect pregnancy success rates?
Embryos that are cryopreserved have the same or an increased chance of implantation compared with that of fresh embryos. The process of freezing and thawing does not impact or harm the health of a baby conceived through IVF, nor does the length of time an embryo was stored affect success rates. Thanks to advancements in technology, there is minimal difference in pregnancy rates between frozen and fresh embryos.
Personalized Embryo Transfer Strategy
Each patient’s condition is different. A personalized embryo transfer plan—including timing, endometrial preparation, and embryo selection—can significantly improve implantation success and pregnancy outcomes.