Fertility Glossary

Frozen embryo transfer (FET)

Thawing and transferring an embryo frozen in an earlier cycle.

FET allows the body to recover from stimulation and the lining to be prepared carefully. It may be done in a natural cycle or with hormone medication.

Related terms

Freeze-all cycle

Freezing every suitable embryo instead of transferring in the fresh cycle.

Vitrification

Ultra-rapid freezing that avoids damaging ice crystals.

Luteal-phase support

Progesterone, sometimes with other medication, given after transfer.

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