This guide is for: Women who have already frozen their eggs and are now ready (or considering) using them to try for a pregnancy through IVF at Janisthaa IVF Center Bangalore. If you have not yet frozen your eggs and want to know about the egg freezing process and cost, see our complete egg freezing guide here.
You have done the hard part — you froze your eggs. Now, when the time is right, using those frozen eggs to achieve a pregnancy through IVF is a structured, well-understood process. This guide explains exactly what happens from the moment you decide to use your eggs, through fertilisation and embryo development, to embryo transfer and the pregnancy test.
How Frozen Egg IVF Differs from a Standard IVF Cycle
In a standard fresh IVF cycle, stimulation, egg retrieval, fertilisation, and embryo transfer all happen in a single controlled sequence over about 3–4 weeks. When you are using previously frozen eggs, the stimulation and retrieval steps are already done — your eggs are waiting in storage. The process now begins at the fertilisation stage, and the timeline from decision to embryo transfer is typically 4–6 weeks.
Step-by-Step: The Frozen Egg IVF Journey at Janisthaa
Step 1: Consultation and Endometrial Preparation (Weeks 1–3)
Your journey begins with a consultation with Dr. Shwetha to review your medical history, any changes in your health since the eggs were frozen, and the male partner’s semen analysis. Your uterine cavity will be checked via ultrasound to confirm the endometrium is healthy and receptive.
You will then begin endometrial preparation: oestrogen tablets or patches (for 2–3 weeks) to grow the uterine lining to an optimal thickness (≥8mm), followed by progesterone supplementation to trigger the secretory phase. This step mimics the natural hormonal changes of a menstrual cycle and prepares the uterus to receive an embryo.
Step 2: Egg Thawing and ICSI Fertilisation (Day 1)
On the designated thaw day, your stored eggs are carefully warmed from −196°C back to body temperature. With the vitrification technique used at Janisthaa IVF, approximately 85–95% of eggs survive this process intact. Surviving mature eggs are immediately fertilised using ICSI (Intracytoplasmic Sperm Injection) — a technique in which a single sperm is precisely injected into each egg. ICSI is the preferred method for frozen egg fertilisation because it bypasses any potential hardening of the egg membrane that can occur after vitrification.
Step 3: Embryo Culture — Days 1 through 5
Fertilised eggs (now called zygotes) are cultured in the laboratory for 5 days, developing through the cleavage stage (Day 2–3) to the blastocyst stage (Day 5). Blastocyst-stage embryos have a higher implantation potential than earlier-stage embryos. Your embryologist will grade each blastocyst based on inner cell mass quality and trophectoderm quality. Only the highest-quality blastocysts are selected for transfer.
Step 4: Embryo Transfer (Day 5 or 6)
Embryo transfer is a simple procedure performed without anaesthesia. A thin flexible catheter is passed through the cervix into the uterine cavity under ultrasound guidance, and the selected embryo is gently placed at the optimal position. The procedure takes approximately 10 minutes. You will rest briefly at the clinic and can return home the same day. Normal light activity is recommended; strenuous exercise and heavy lifting should be avoided.
Step 5: The Two-Week Wait and Pregnancy Test
Progesterone supplements are continued for approximately 2 weeks following transfer to support the uterine lining. A blood beta-hCG test is performed approximately 10–12 days after transfer to determine whether implantation has occurred. If positive, the beta-hCG level is rechecked 48 hours later to confirm a rising trend. A transvaginal ultrasound at approximately 6–7 weeks gestational age will confirm the presence of a foetal heartbeat.
Frozen Egg IVF Success Rates: What the Data Shows
Success rates for frozen egg IVF are primarily determined by the age of the eggs at the time of freezing — not the woman’s current age. This is the central advantage of egg freezing: by preserving eggs at a younger age, you preserve the chromosomal quality that those eggs had at that time.
Age When Eggs Were Frozen | Egg Survival Rate (Thaw) | Fertilisation Rate (ICSI) | Blastocyst Development Rate | Cumulative Live Birth Rate (10–15 eggs) |
Under 30 | ~90–95% | ~75–85% | ~50–60% of fertilised eggs | ~85–90% |
30–34 | ~87–92% | ~70–80% | ~45–55% | ~70–80% |
35–37 | ~85–90% | ~65–75% | ~35–45% | ~45–60% |
38–40 | ~80–88% | ~60–70% | ~25–35% | ~25–35% |
Clinical pregnancy rates per individual egg thawed are approximately 4–12%, which is why having 10–20 eggs dramatically improves overall odds. Women who froze 10–20 mature eggs under age 35 have a 70–90% cumulative live birth rate across all eggs.
How Many Frozen Eggs Do You Need for a Reasonable Chance of Success?
This is the most common question from women who have already frozen eggs and are now ready to use them. The answer depends on your age at freezing:
- Eggs frozen before 35:10–15 mature eggs give approximately a 70–90% cumulative chance of at least one live birth.
- Eggs frozen at 35–37:15–20 mature eggs are recommended to achieve similar odds. Fewer than 10 eggs frozen at this age may yield only a 30–40% cumulative chance.
- Eggs frozen at 38+:Even 20 eggs may yield only a 25–40% cumulative chance. Preimplantation Genetic Testing (PGT-A) of embryos is often recommended to identify chromosomally normal embryos before transfer.
If you froze fewer eggs than recommended and are concerned about your chances, speak with Dr. Shwetha about whether additional egg retrieval cycles could be considered before proceeding to transfer.
What Happens If All Frozen Eggs Are Used Without a Pregnancy?
If all your frozen eggs are used across one or more cycles without achieving a successful pregnancy, your options include:
- A fresh IVF cycle using new eggs retrieved at your current age
- IVF with donor eggs (if your current age or ovarian reserve makes this the more viable option)
- A detailed review with Dr. Shwetha to investigate other factors such as endometrial receptivity (ERA test), immunological factors (recurrent implantation failure workup), or uterine anatomy
Why Choose Janisthaa IVF for Your Frozen Egg IVF Cycle?
At Janisthaa IVF Center, the embryology laboratory is equipped with a dedicated vitrification station and continuous culture system to maintain optimal conditions throughout embryo development. Dr. Shwetha and the embryology team review each patient’s thaw and fertilisation report personally to plan the most appropriate transfer strategy.
Every frozen egg IVF cycle at Janisthaa includes full monitoring of the endometrial preparation, ICSI fertilisation, blastocyst grading, and embryo transfer — with a single point of care from the same doctor throughout.
Our Bangalore centres are located at Basaveshwar Nagar, RR Nagar, and Malleshwaram.
Ready to use your frozen eggs? Schedule a consultation with Dr. Shwetha or call+91 95911 11407 to plan your frozen egg IVF cycle.
