Fresh vs Frozen Embryo Transfer: What to Know
Embryos created during IVF can be transferred in the same cycle (fresh) or frozen and transferred in a later cycle (frozen). There are situations where either approach is suitable.
Your doctor decides which path fits you, weighing options such as frozen embryo transfer.
What is a fresh transfer?
In a fresh transfer the embryo is placed in the uterus in the same cycle as egg retrieval. In some situations this may be preferred.
Suitability is assessed by the ovarian response and the uterine environment.
What is a frozen transfer (FET)?
In a frozen transfer the embryos are stored and transferred in a cycle when the uterine environment is most suitable. This gives flexibility in timing.
Approaches such as progesterone support can be used to prepare the lining.
When is each considered?
The decision is individual. Factors that may be weighed include:
- Ovarian response and OHSS risk
- The state of the uterine lining
- Whether genetic testing (PGT) will be done
- Personal and medical history
The freeze-all approach
In some situations all embryos are frozen and transfer is postponed. This is called freeze-all and may be considered to move transfer to a more suitable time.
This approach is part of individualised planning.
How is the decision made?
The most suitable path is planned by your doctor for your situation. The aim is to match the embryo and the uterine environment at the best point.
For what follows, see our article on implantation symptoms.
Related Reading
- Frozen Embryo Transfer (FET)
- After Embryo Transfer: Implantation Symptoms and What to Expect
- Progesterone and Luteal Phase Support in IVF
Sources and references
This article is supported by the following independent, authoritative sources: