Fresh vs Frozen Embryo Transfer Success Rates Explained

Fresh embryo transfer occurs days after fertilization, while frozen uses vitrification to freeze embryos, maintaining viability. Preimplantation genetic testing (PGT) ensures embryo health. Both methods have high success rates, with frozen transfers offering flexibility for optimal timing.

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Key Takeaways

Frozen Embryo Transfer Benefits and Vitrification Process

Vitrification rapidly freezes embryos using liquid nitrogen (-196°C) to prevent ice crystal damage. This process preserves embryo quality, allowing storage for future transfers. Frozen transfers offer scheduling flexibility and enable hormone level normalization before implantation.

Success Rates of Fresh vs Frozen Embryo Transfers

Both fresh and frozen embryo transfers achieve comparable pregnancy success rates. Frozen transfers may improve outcomes by allowing endometrial lining optimization through hormone therapy. Studies show no significant difference in live birth rates between the two methods.

When to Choose Fresh Embryo Transfer Over Frozen

Fresh transfers are ideal when ovarian stimulation results in optimal hormone levels. They avoid freezing/thawing risks and are often preferred for single embryo transfers (SET) to reduce multiple pregnancy chances. Patients with normal endometrial thickness may benefit from immediate implantation.

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