Reviewed by: Dr. Priyadatt Patel, Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead. Last updated: 26 May 2026.
Advanced ART · FET
Frozen Embryo Transfer (FET)
Frozen embryo transfer involves transferring previously cryopreserved embryos into a hormonally-prepared or natural cycle uterus. Modern vitrification has made FET outcomes equivalent or superior to fresh transfer in many settings.
Why FET often outperforms fresh
Endometrial receptivity matters
Fresh IVF cycles can produce supraphysiological hormone levels that may impair endometrial receptivity. FET allows transfer into a more receptive endometrium – either natural or hormonally prepared.
Cycle preparation
Natural vs medicated FET
Natural cycle FET uses the patient’s own ovulation as the trigger. Suitable for regular cyclic patients.
Medicated cycle FET uses oestrogen and progesterone to prepare the endometrium. More predictable timing, suitable for most patients.
Outcomes and safety
Pregnancy and pregnancy outcomes
FET has equivalent or better live birth rates than fresh transfer in many populations. OHSS risk is eliminated. Neonatal outcomes are favourable, with slightly higher birth weights than fresh transfers.
Common questions
Frequently asked
How long can embryos be frozen?
Vitrified embryos remain viable for many years. Live births have been reported from embryos frozen for over 20 years.
Is FET safer than fresh transfer?
For patients at OHSS risk, yes – elective freeze-all with delayed FET eliminates OHSS risk while maintaining excellent pregnancy outcomes.
Does FET work as well as fresh IVF?
Per-embryo implantation rates are equivalent or better. Cumulative live birth rates from a stimulation cycle now favour freeze-all-and-FET in many indications.
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Dr. Priyadatt Patel
Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead
MS OBGyn · Pregnancy Care · Advanced Gynaecological Ultrasound · Fertility Preservation
ESHRE / ESGE / AAGL / ASRM guideline-aligned practice. 3D Karl Storz precision technique. Fertility-preservation-first philosophy. Evidence-based decisions, honest counselling, long-term outcomes orientation.
Endometriosis
Superficial to deep infiltrating, fertility-preserving excision
IVF & Fertility
Individualised protocols, ART Level 2 lab, transparent outcomes
Advanced Laparoscopy
3D Karl Storz precision, nerve-sparing technique
Pregnancy Care
Antenatal care, high-risk pregnancy, advanced ultrasound
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