Frozen embryo transfer (FET)
Also written as FET
An embryo transfer using an embryo that was previously frozen and is thawed for the procedure.
In plain English
It's a transfer using an embryo that was frozen from an earlier cycle and thawed for this attempt.
Why it matters
It allows extra embryos from one egg collection to be used in later cycles, and cumulative live birth rates take these into account.
Related terms
Guides that cover this
Sources
- IVF: what is IVF and how does it work?, HFEA (UK fertility regulator). Link checked 17 September 2026.
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