Embryo freezing (vitrification) at Mother Hospitals allows IVF couples to freeze surplus embryos for future transfers without repeating a full IVF cycle. Vitrification achieves over 95% embryo survival rates. Stored under ART Act 2021 consent. Frozen Embryo Transfer (FET) cycles are simpler and often have similar or better outcomes than fresh transfers. Call 97059 93366.
Freeze your surplus IVF embryos with confidence at Mother Hospitals & IVF Center, Boduppal. Our vitrification programme achieves over 95% embryo survival rates, giving couples multiple chances at pregnancy from a single stimulation cycle — without the cost and stress of starting again.
MBBS, DGO, PG Diploma in ART – Kiel University, Germany | 20+ Years Experience | TGMC Reg: 50624
Embryo freezing (cryopreservation) is the process of preserving fertilised embryos created during IVF at sub-zero temperatures for future use. Modern vitrification technique has transformed embryo freezing from an uncertain process into one with over 95% embryo survival — making frozen embryo transfers now comparable in success to fresh transfers.
Slow freezing (the older technique) gradually reduces temperature at a controlled rate of 0.3°C per minute. While functional, it allows micro-ice crystals to form inside cells — damaging their membranes and reducing survival rates to 70–80%. Vitrification (the modern standard) works differently: the embryo is equilibrated in a high-concentration cryoprotectant solution and plunged directly into liquid nitrogen at an ultra-rapid rate (over 20,000°C per minute). This converts the intracellular fluid into a glass-like state — no ice crystals form, no cell damage occurs.
Vitrification is now the global standard for embryo cryopreservation because the data is conclusive: blastocyst survival rates exceed 95%, and post-thaw pregnancy rates are comparable — sometimes superior — to fresh embryo transfers. The superior outcome for frozen embryos in certain patient groups (especially PCOS patients and OHSS-risk cases) has led to the widespread adoption of the freeze-all strategy. Mother Hospitals uses vitrification exclusively for embryo banking.
Embryos may be frozen in several clinical scenarios — both as a planned part of your IVF treatment and as a precautionary measure.
The most common scenario. After your fresh IVF embryo transfer, good-quality remaining embryos are vitrified. These can be used in FET cycles — at lower cost and with no repeat stimulation needed.
When a woman responds very strongly to stimulation (many follicles, high oestradiol), fresh transfer is avoided to prevent OHSS. All embryos are frozen, and transfer occurs in a subsequent, unstimulated FET cycle once OHSS risk has passed.
When embryos undergo PGT-A genetic testing, they must be biopsied and frozen while results are awaited (typically 2–3 weeks). Only chromosomally normal embryos are then thawed and transferred.
If the endometrium is sub-optimal (thin, or showing an elevated progesterone level at trigger), elective freeze-all and a planned FET in a subsequent cycle often gives better implantation rates than proceeding with a fresh transfer.
PCOS patients have elevated OHSS risk and may also have a less receptive endometrium during stimulated cycles. The standard approach at Mother Hospitals for PCOS-IVF is freeze-all followed by FET — for both safety and better pregnancy outcomes.
The freeze-all strategy — freezing all viable embryos and planning transfer in a subsequent unstimulated cycle — has become standard practice in certain clinical situations. Here's why.
Ovarian hyperstimulation syndrome (OHSS) is a potentially serious complication of IVF stimulation — characterised by enlarged ovaries, fluid accumulation, and in severe cases, clotting or kidney impairment. Fresh transfer in a hyperstimulated cycle worsens OHSS because pregnancy triggers further hCG production. Freeze-all removes this risk entirely — all embryos are stored, and transfer occurs only when the ovaries have fully recovered.
In couples with recurrent implantation failure or in those opting for personalised transfer timing, the ERA (Endometrial Receptivity Array) test identifies the precise window of implantation for each woman. Freeze-all is a prerequisite for ERA-guided FET — embryos are frozen during the diagnostic cycle, and transfer is timed to the personalised implantation window in the subsequent cycle.
Multiple studies and meta-analyses have shown that PCOS patients achieve higher ongoing pregnancy rates with frozen embryo transfer compared to fresh transfer. The reasons are twofold: (1) OHSS risk is eliminated by not transferring in the stimulated cycle, and (2) the endometrium in a non-stimulated FET cycle is more physiologically receptive — not exposed to supraphysiological oestrogen levels from stimulation. Dr. E. Prashanthi Reddy routinely recommends freeze-all for PCOS patients undergoing IVF at Mother Hospitals.
Vitrification has transformed embryo freezing outcomes. Published data from leading IVF programmes worldwide consistently reports the following.
✦ Data based on published peer-reviewed literature. Individual outcomes depend on embryo grade, age, and clinical factors. Discuss your specific prognosis at consultation.
When you are ready to use your frozen embryos, a Frozen Embryo Transfer (FET) cycle is planned. FET cycles are simpler, shorter, and less demanding than a full IVF stimulation cycle.
The lining of the uterus is prepared either in a natural cycle (monitoring your own ovulation) or with oestrogen tablets/patches to build the endometrium to a minimum of 7–8 mm. Progesterone is then added to prepare for transfer.
On the planned transfer day, the selected frozen embryo is thawed. Post-thaw survival is confirmed by the embryologist — over 95% of blastocysts survive thawing. The embryo is assessed for integrity and expansion before transfer proceeds.
The thawed embryo is transferred to the uterine cavity via a thin flexible catheter under ultrasound guidance — the same as in a fresh IVF cycle. No anaesthesia is required. The procedure takes 5–10 minutes and the patient can rest briefly before returning home.
Progesterone support (vaginal pessaries or injections) continues post-transfer. A blood beta-hCG test is done 14 days later. A positive result leads to an early viability scan at 6–7 weeks. See our full Frozen Embryo Transfer page for detailed protocol information.
The ART Act 2021 governs embryo storage in India. Under the Act, embryos are stored for the period specified in your consent form — typically reviewed annually.
The ART Act 2021 requires written informed consent from both partners for embryo storage. Initial consent covers a defined period (typically up to 5 years), which is renewable with updated consent. Embryos will not be used, transferred, or discarded without written consent from both partners. Mother Hospitals will contact you before your consent renewal deadline each year.
Under Indian law, both the male and female partner whose gametes were used to create the embryo must provide and renew consent for storage and any future use. This protects the rights of both individuals. In the event of a dispute about embryo use (for example, in cases of divorce or separation), the ART Act provides a legal framework — our team can advise you.
Many couples complete their family but still have frozen embryos in storage. The ART Act 2021 provides clear options for unused embryos.
You may choose to keep embryos in storage indefinitely, renewing consent each year. Many couples choose this option as a safety net in case they decide to have another child in the future, or in case of unexpected life events.
If both partners are certain they will not use the embryos and do not wish to donate them, the embryos can be discarded (allowed to perish). This requires written consent from both partners. Our counselling team will support you through this decision.
Under the ART Act 2021, couples may choose to donate unused embryos to other couples experiencing infertility. Donation must be through a registered ART Bank. The donor couple's anonymity is protected. Both partners must consent to donation.
Where permissible under applicable Indian law and institutional ethics approval, some couples choose to donate embryos for research purposes. This option requires specific informed consent and is governed by strict regulatory requirements under the ART Act 2021.
Embryo vitrification and storage at Mother Hospitals includes the laboratory procedure, cryoprotectant media, vitrification device, labelled cryostorage, consent documentation, and first-year storage.
Includes embryologist time, vitrification media, cryovials/goblets, liquid nitrogen storage setup, ART Act consent documentation, and first-year cryostorage fee.
Annual cryostorage fee for continued storage beyond the first year. Includes liquid nitrogen replenishment, monitoring, and annual consent renewal documentation.
A Frozen Embryo Transfer (FET) cycle is significantly less expensive than a fresh IVF cycle — no stimulation injections, no egg retrieval. Includes endometrial preparation, monitoring scans, embryo thaw, and transfer procedure.
✦ Embryo freezing is usually included or bundled into IVF package pricing. Confirm exact costs at consultation. GST applicable as per government regulations.
We do not use slow freezing. Every embryo at Mother Hospitals is vitrified using the gold-standard technique — maximising your embryo survival rate and protecting the investment you have made in your IVF cycle.
All consent, storage, and use processes at Mother Hospitals follow the ART Act 2021. You receive full documentation of your frozen embryos and your rights over them. Consent is yours to renew, modify, or withdraw.
Dr. E. Prashanthi Reddy completed her PG Diploma in ART from Kiel University, Germany — training that included advanced embryology, cryopreservation protocols, and FET optimisation. Your frozen embryos are in expert hands.
Our cryobank is temperature-monitored continuously with liquid nitrogen level alerts. Each embryo is stored in a uniquely labelled goblet. The risk of mix-up or loss is minimised through our rigorous witnessing and double-labelling protocol.
When you are ready to use your frozen embryos, we plan your FET cycle carefully — natural cycle or medicated, ERA-guided if indicated, optimised for your endometrial receptivity. We don't just freeze embryos; we plan their successful use.
Mother Hospitals has supported over 10,000 families on their fertility journey. Our embryo freezing and FET programme is one part of a comprehensive IVF service focused on maximising your cumulative chance of success.
Yes — and blastocyst freezing is preferred where possible. Day 5/6 blastocysts have higher vitrification survival rates (over 95%) and higher implantation rates per transfer compared to Day 3 cleavage embryos. At Mother Hospitals, we culture embryos to blastocyst stage (Day 5) by default, freezing those that reach the appropriate grade. Day 3 freezing is done when blastocyst culture is not suitable for a given cycle.
There is no fixed "correct" number — it depends on your age, embryo quality, and family planning goals. In general, banking more frozen embryos gives you more attempts and higher cumulative pregnancy rates. For women under 35, 2–3 good-quality blastocysts typically provide a good chance of at least one pregnancy. For women over 38, banking more embryos (with or without PGT-A testing) is often recommended. Dr. E. Prashanthi Reddy will discuss your specific situation at consultation.
Yes — the evidence is very reassuring. Decades of data from millions of FET cycles worldwide show that babies born from frozen embryos have similar or better birth outcomes than those from fresh IVF transfers. There is no evidence of increased birth defects or developmental problems from vitrification. The freeze-all strategy has in some studies shown slightly better obstetric outcomes (birth weight) compared to fresh transfer, likely because the endometrium is unstimulated during FET.
Vitrification does not damage embryo quality when performed correctly. Over 95% of blastocysts survive the freeze-thaw cycle intact. The embryo's genetic content is not affected by freezing — a normal embryo before vitrification is a normal embryo after thawing. What does matter is the quality of the embryo before freezing: we only freeze embryos that have reached appropriate developmental grades, as poor-quality embryos that are frozen will still be poor-quality after thawing.
Yes — natural cycle FET is an option for women with regular ovulatory cycles. In a natural FET cycle, ovulation is monitored with ultrasound and the frozen embryo is transferred at the appropriate time after the LH surge or ovulation, without any exogenous hormone stimulation of the endometrium. Natural cycle FET is gentler and avoids the side effects of oestrogen supplementation — it is a good option for suitable candidates.
This is an important legal question. Under the ART Act 2021, both partners whose gametes created the embryo have rights over it. In the event of separation or divorce, the embryos cannot be used by one partner without the other's consent — unless specific legal arrangements have been made in writing. In the event of a partner's death, usage of frozen embryos is subject to the deceased partner's prior written consent and applicable succession law. We strongly recommend all couples discuss and document their wishes in the consent form regarding these scenarios.
The ART Act 2021 links embryo storage to valid, renewed consent — typically reviewed annually or at the end of the consent period (often up to 5 years, renewable). There is no absolute maximum in the Act that permanently prevents continued storage — storage continues as long as consent is actively renewed and fees are paid. Some countries (UK, for example) have defined 10-year limits, but India's Act does not currently prescribe the same fixed limit. Our team will keep you informed as regulations evolve.
Not necessarily — and in some patient groups, FET success rates are higher. For PCOS patients and OHSS-risk cases, FET consistently outperforms fresh transfer in published studies. For other patients, FET and fresh transfer are broadly comparable. The cumulative success rate (fresh + all FET cycles from one egg collection) is always higher than a single fresh transfer alone — which is one of the key benefits of embryo freezing. FET cycles are also less stressful, less expensive, and have fewer monitoring visits than a full IVF stimulation cycle.
Dr. E. Prashanthi Reddy · TGMC Reg: 50624