Vitrification is an ultra-rapid freezing technique that transforms eggs or embryos into a glass-like solid state within milliseconds — preventing the formation of ice crystals that damage cell structures during conventional slow freezing. It has replaced older slow-freeze methods in most modern IVF laboratories because survival rates after warming are significantly higher.
At Dr Bhavana's clinic at Cloudnine Hospital, Kompally, vitrification is used in two main contexts: storing surplus good-quality embryos after an IVF cycle (so they can be used in future Frozen Embryo Transfer cycles), and preserving eggs for women who wish to delay childbearing or face fertility-threatening medical treatment.
A couple retrieves 10 eggs in their IVF cycle. After ICSI, 7 fertilise, 4 develop to blastocyst stage. One embryo is transferred fresh. The remaining 3 high-quality blastocysts are vitrified. If the fresh transfer does not succeed — or they decide to have a second child — the frozen embryos can be warmed and transferred without repeating the full stimulation process.
A 32-year-old woman is not ready to start a family but is aware that egg quality declines significantly after 35. She freezes eggs now, while her ovarian reserve is strong — preserving the option to use them in her late 30s or early 40s when she is ready. Eggs frozen at 32 retain the fertility potential of a 32-year-old's eggs, regardless of when they are used.
A 28-year-old woman is diagnosed with breast cancer. Before chemotherapy begins — which can damage or destroy her ovarian reserve permanently — she undergoes ovarian stimulation and egg retrieval over 10–14 days. Her eggs are vitrified and stored until she completes treatment and is cleared to attempt pregnancy.
A woman's IVF cycle produces good embryos but her endometrial lining is not ideal for transfer in the same stimulation cycle — often due to elevated progesterone or risk of OHSS. All embryos are vitrified and transferred in a subsequent, dedicated Frozen Embryo Transfer (FET) cycle when hormonal conditions are optimised. FET pregnancy rates are often equivalent or superior to fresh transfer.
| For egg freezing | 10–14 days of stimulation + egg retrieval day. No transfer in the same cycle. |
| For embryo freezing | Happens as part of an IVF cycle — embryos not transferred are frozen 5–6 days after egg retrieval. |
| Vitrification itself | A laboratory process performed immediately after egg retrieval or embryo culture — no additional time or procedures for the patient. |
| Frozen Embryo Transfer (FET) | Approximately 3–4 weeks of endometrial preparation + transfer procedure (10–15 minutes). |
| Storage | Annual consent renewal. Storage fees apply after the first year (included in some packages). |
90–95% of blastocysts vitrified in a high-quality lab survive the warming process. Survival rates depend on embryo quality at the time of freezing and the skill of the embryology team.
Frozen Embryo Transfer (FET) pregnancy rates are equivalent to — and in some cases better than — fresh transfers. The absence of ovarian stimulation hormones during FET allows the endometrium to develop in a more natural state.
Egg survival after vitrification is typically 70–90%, with fertilisation rates approaching those of fresh eggs when ICSI is used. Younger age at freezing (under 35) produces higher survival and fertilisation rates.
For elective freezing, earlier is better — egg quality declines with age. For FET cycles, attend all monitoring scans and take endometrial preparation medications as directed. Avoid smoking and alcohol during the preparation cycle.
This was true with older slow-freeze technology. With vitrification, survival rates are very high and FET pregnancy rates are equivalent or superior to fresh transfers in many studies — largely because the uterine environment is more natural during a FET cycle without the residual effects of ovarian stimulation.
✓ Fact: Vitrified embryo FET cycles consistently produce excellent pregnancy rates.Egg freezing preserves your fertility options — it does not guarantee a future pregnancy. Success depends on the number and quality of eggs frozen, age at freezing, and future uterine health. The earlier eggs are frozen, the better the quality and the higher the eventual success rate. Dr Bhavana discusses realistic expectations before any fertility preservation cycle.
✓ Fact: Egg freezing preserves options — earlier freezing gives better results.Book a consultation — Dr Bhavana will assess your ovarian reserve and explain your realistic options clearly.
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