Embryo Cryopreservation Process and Success Rates

Embryo cryopreservation involves freezing and storing embryos for future IVF cycles. The process preserves fertility and improves success rates, especially with advanced techniques like vitrification. Success largely depends on embryo quality, woman’s age, and clinic expertise, making it a valuable option for those planning delayed or repeated fertility treatments.

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1. As more individuals and couples explore assisted
reproductive technologies, the ability to preserve embryos for
future use has become a major asset in fertility planning.
Known as embryo cryopreservation, this process involves
freezing embryos at ultra-low temperatures so they can be
Embryo
Cryopreservation
Process and Success
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2. thawed and transferred later. At SCI IVF Hospital, we’ve seen
firsthand how embryo freezing enhances flexibility, lowers
stress, and significantly improves long-term success rates for
IVF patients.
What is Embryo Cryopreservation?
Embryo cryopreservation refers to the freezing and long-term
storage of fertilized embryos. After eggs are retrieved during
an IVF cycle and successfully fertilized with sperm, the
resulting embryos are cultured in the lab for a few days.
Those that develop normally and meet quality criteria can be
transferred immediately or frozen for future use.
This technique is especially helpful for individuals who:
Wish to delay pregnancy for personal, medical, or career
reasons
Have surplus embryos from an IVF cycle
Want to increase the chances of a second child with the
same genetic material
Require preimplantation genetic testing (PGT) before
embryo transfer
Step-by-Step Embryo Cryopreservation Process
At SCI IVF Hospital, embryo freezing follows a highly refined
protocol:
1. Fertilization and Embryo Culture
After IVF or ICSI, fertilized eggs are observed and
cultured to the blastocyst stage (day 5 or 6), which offers
better implantation potential.
2. Embryo Grading and Selection
Our embryologists evaluate embryo quality based on cell
structure, symmetry, and development rate. Only top-
grade embryos are selected for freezing.

3. 3. Vitrification (Rapid Freezing)
The chosen embryos are exposed to a cryoprotectant
and then frozen instantly using liquid nitrogen at -196°C.
This vitrification technique prevents ice crystal formation,
which could otherwise damage cell integrity.
4. Secure Storage
Embryos are stored in specialized cryotanks under
constant temperature monitoring. Each is labeled with
patient-specific information to ensure safety and
traceability.
Success Rates of Embryo Cryopreservation
Thanks to major advancements in freezing methods, the
success rates for frozen embryo transfers (FET) now rival—
if not exceed—those of fresh transfers. At SCI IVF Hospital,
our embryo cryopreservation success rates are a result of
both cutting-edge technology and expert lab protocols.
Here’s what recent data shows:
Embryo Survival Rate: Over 90% of embryos survive
the thawing process using vitrification.
Implantation Rates: Comparable to fresh embryo
transfers, ranging from 40–60% depending on maternal
age and embryo quality.
Pregnancy Outcomes: Frozen embryos have been
linked to slightly higher live birth rates in some studies
due to more controlled uterine environments.
Advantages of Using Frozen Embryos
Choosing embryo cryopreservation offers a wide range of
benefits:
Flexibility: Allows timing the embryo transfer to when

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the body is hormonally stable or most receptive.
Fewer IVF Cycles: Avoids repeated ovarian stimulation
and egg retrieval procedures, saving time, money, and
physical stress.
Preservation of Fertility: Ideal for cancer patients or
those with medical conditions requiring immediate
treatment.
Siblings in the Future: Couples can plan for more than
one child using embryos from a single IVF cycle.
Why SCI IVF Hospital?
At SCI IVF Hospital, we offer one of India’s most advanced
cryopreservation labs, complete with digital tracking, 24/7
monitoring, and a skilled embryology team. Our embryo
freezing success rates are among the highest in the country
because we personalize care at every step.
Conclusion
Embryo cryopreservation is more than just a backup plan—it’s
a proactive choice in fertility care. With reliable success rates
and flexible timing, it empowers patients to approach
pregnancy on their own terms. At SCI IVF Hospital, we are
proud to support patients in preserving hope, choice, and the
future.
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