What Is Frozen Embryo Transfer (FET) in Surrogacy?

Last updated: · · Based on data from 196+ surrogacy agency compensation packages

A frozen embryo transfer (FET) uses a previously frozen embryo — one that was created during an IVF cycle and cryopreserved — rather than a fresh, newly fertilized embryo. FETs are the most common type of embryo transfer in surrogacy arrangements.

Why Frozen Embryo Transfer (FET) Matters for Surrogates

FETs allow intended parents to have embryos genetically tested (PGT-A) before transfer, schedule the transfer at the optimal time, and avoid coordinating the surrogate's cycle with the egg retrieval cycle. They have comparable or better success rates than fresh transfers in most studies.

How Frozen Embryo Transfer (FET) Works in Surrogacy

For a FET, you'll go through a preparation protocol (often 3–4 weeks) using estrogen and progesterone to build your uterine lining to the right thickness. Once your lining is ready, the frozen embryo is thawed and transferred. The protocol is similar to a mock cycle but this time it's the real thing.

Real-World Example

Almost every gestational surrogacy today uses a frozen embryo transfer. The intended parents complete their IVF cycle, freeze the resulting embryos (sometimes testing them first), then coordinate your medical prep cycle for the transfer on a timeline that works for everyone.

Frequently Asked Questions

What is a frozen embryo transfer in surrogacy?
A frozen embryo transfer (FET) is when a previously frozen embryo is thawed and transferred into the surrogate's uterus. This is the most common type of transfer in surrogacy — embryos are typically created via IVF well before the surrogate is matched and medically cleared.
Is frozen embryo transfer safe?
Yes. FET is standard practice with excellent success rates — modern vitrification (flash-freezing) technology means embryos survive the freeze-thaw process at rates over 95%. Pregnancy rates with frozen transfers are comparable to (and sometimes better than) fresh transfers.
How long do frozen embryos last?
Embryos can be frozen indefinitely with no degradation in quality. Healthy babies have been born from embryos frozen for 20+ years. The intended parents decide when embryos are thawed for transfer based on the surrogacy timeline.

Related Surrogacy Terms

Embryo Transfer Mock Cycle IVF (In Vitro Fertilization) Beta-hCG Embryo Transfer Fee
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Source: SurroScore's proprietary database of surrogate-reported compensation data and agency compensation packages, collected from direct agency outreach, public filings, and verified surrogate reviews. Data current as of March 2026.