Frozen Embryo Transfer
Also written as: FET — Frozen Embryo Transfer
The transfer of previously cryopreserved embryos after thawing, performed in a separate cycle from the original stimulation.
Full Definition
Frozen Embryo Transfer (FET) involves the thawing and transfer of previously cryopreserved embryos in a cycle separate from the original ovarian stimulation. This procedure allows for optimal endometrial preparation without the hormonal influences of ovarian stimulation. FET cycles can be performed in natural cycles with ovulation monitoring or with hormone replacement therapy to artificially prepare the endometrium. The process includes careful embryo thawing protocols, assessment of post-thaw survival and quality, and precisely timed embryo transfer based on endometrial development. FET has become increasingly common with improved cryopreservation techniques and recognition of potential benefits over fresh transfers in certain populations.
Usage
Usage note: Hyphenate the full term when used as adjective; FET abbreviation is widely accepted in clinical documentation.
In Context
- "The frozen embryo transfer was scheduled for day 5 following confirmation of adequate endometrial thickness." — Transfer coordination notes
- "FET success rates have improved significantly with advances in vitrification technology." — Outcome analysis report