Hemanth Valluri: Can a Frozen Embryo Survive Thawing, Biopsy, and Refreezing?
Hemanth Valluri, Chief Embryologist at Cloudnine Group of Hospitals, shared on LinkedIn:
“Can a frozen embryo survive thaw – biopsy – refreeze?
One question often asked in the IVF laboratory:
‘If a frozen blastocyst is thawed, biopsied for PGT-A, and frozen again… will it still implant?’
The answer may surprise you.
A recent 2026 study reported approximately:
- 92.5% cumulative blastocyst survival after two warming events
- 50.9% implantation rate among euploid embryos transferred
And importantly, pregnancy and live-birth outcomes were not significantly different from embryos biopsied before their first vitrification.
But here is the real message
Survival ≠ implantation.
A blastocyst can survive warming beautifully, yet implantation depends on multiple factors:
- Embryo quality
- Chromosomal status
- Vitrification and warming technique
- Biopsy technique
- Endometrial receptivity
- Laboratory conditions and experience
The Embryology Perspective
Vitrification – Warming – Biopsy – Refreezing – Warming – Transfer
Every step requires precision.
When the laboratory has a validated vitrification/warming protocol, careful biopsy technique and strict quality control, a previously frozen blastocyst can retain significant developmental and implantation potential.
The key takeaway:
A second freeze is not automatically a second chance lost.
It is the quality of the embryo + laboratory performance + clinical factors that ultimately matter.
Good embryology is not just about freezing an embryo – it is about protecting its potential at every step.”
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