Fertility preservation is now one of the most important topics in reproductive medicine, and for good reason. If you’re not yet ready to have a child, are facing a medical diagnosis, or simply want to find out what your options are, understanding the difference between egg freezing and embryo freezing will enable you to make a decision based on evidence rather than on assumption. Although both procedures help preserve your future fertility, they work differently, suit different circumstances, and carry different consequences. This guide cuts through the confusion and provides a clear, medically accurate comparison.
What Is Egg Freezing and What Is Embryo Freezing?
With egg freezing (also called oocyte cryopreservation), your eggs are collected, frozen while still unfertilised, and stored for later. When you decide to use them, your eggs are thawed, fertilised with sperm in the lab, and any embryos created are placed into your uterus using IVF.
Embryo freezing (embryo cryopreservation) starts the same way, with your eggs being collected. This time, your eggs are fertilised with sperm before freezing. The embryos are grown in the lab until they reach the blastocyst stage, usually around day 5. Then, they are frozen and stored. When you are ready to try for pregnancy, the embryos are thawed and placed directly into your uterus.
Both methods use vitrification. This is an ultra-rapid freezing process in liquid nitrogen at minus 196 degrees Celsius. Vitrification has replaced older slow-freezing methods and has made eggs and embryos much more likely to survive after thawing.
Key Differences: A Direct Comparison
| Egg Freezing | Embryo Freezing | |
| What is frozen | Unfertilised eggs | Fertilised embryos |
| Partner or donor sperm required | No | Yes |
| Best suited for | Single women, women without a current partner, and those wanting maximum future flexibility | Couples, married women, those who have a confirmed sperm source |
| Live birth rate per transfer | Approximately 32%; rising to 35% when 15 or more eggs are frozen | Approximately 41% per transfer |
| Post-thaw survival rate | Approximately 90% with vitrification | Higher; embryos are more resilient post-thaw than eggs |
| Ethical considerations | Fewer; unfertilised eggs raise no embryo disposal questions | More complex; decisions about unused embryos are required |
| MediSave eligibility (Singapore) | Not eligible; egg freezing is self-funded | Eligible; embryo freezing as part of IVF attracts MediSave and government co-funding |
| Singapore cost per cycle | SGD $ 10,000 – $ 15,000 | SGD $ 10,000 – $ 25,000 depending on clinic |
Success Rates: What the Evidence Actually Shows
Egg freezing:
A cohort study and literature review published in the Journal of Clinical Medicine (2023) examined 167 women at Guy’s Hospital NHS Foundation Trust. The live birth rate per embryo transfer after egg freezing was 35%. If you freeze 15 or more eggs, your chances are even higher. On average, 74% of eggs survived thawing, and 67% were fertilised.
Embryo freezing:
A systematic review and meta-analysis in Human Reproduction (2023) compared all three main fertility preservation techniques. Live birth rates after embryo freezing were 41% per transfer. For egg freezing, the rate was 32%. These are the most directly comparable figures to help you decide.
What influences your individual success rate:
Your age at the time you freeze is the most important factor for both methods. If you freeze at a younger age, your eggs or embryos are more likely to be of higher quality and yield better results. Other factors include how many eggs or embryos you freeze, their quality, and the standards of the clinic’s laboratory.
Who Should Consider Each Option?
Egg freezing is most appropriate for:
If you do not have a partner right now or are not ready to decide about fertilisation, egg freezing can help you keep your options open. You get to choose who fertilises your eggs and when the time is right for you.
If you are about to start medical treatment such as chemotherapy or radiation, egg freezing can help protect your future fertility. Freezing your eggs before treatment begins gives you more options, whatever the outcome.
If you want to extend your reproductive timeline while your egg quality is still high, egg freezing may be a good choice. In Singapore, you can choose elective egg freezing if you are between 21 and 37 years old. Freezing your eggs earlier within this age range usually yields better results.
Embryo freezing is most appropriate for:
If you and your partner have completed an IVF cycle and have extra embryos, freezing these embryos is the next step. This helps you keep high-quality embryos for future use if you didn’t transfer them during the fresh cycle.
If you and your partner are about to start medical treatment and both egg and sperm are available, embryo freezing may be a better option. Embryo freezing usually leads to higher success rates after thawing compared to egg freezing alone.
If you are a same-sex couple or a single woman using donor sperm, you can also choose embryo freezing. Creating embryos with donor sperm before freezing gives you a stronger starting point for future transfer.
Costs in Singapore
| Cost Component | Egg Freezing | Embryo Freezing |
| Cycle cost | SGD $10,000 – $15,000 | SGD $10,000 – $25,000 |
| Medications | SGD $1,500 – $3,500 (often billed separately) | SGD $1,500 – $6,000 (often billed separately) |
| Annual storage | SGD $500 – $600 per year | SGD $200 – $500 per year |
| FET cycle (when using frozen embryos) | SGD $2,200 – $5,000 | SGD $2,200 – $5,000 |
| MediSave | Not eligible | Up to SGD $6,000 per cycle (first cycle); lifetime cap SGD $15,000 |
| Government co-funding | Not eligible | Up to 75% at public hospitals for eligible Singapore citizen couples |
In Singapore, elective egg freezing is fully self-funded, and neither MediSave nor government subsidies are available. However, embryo freezing done as part of an IVF cycle is covered by MediSave, and public hospitals offer government co-funding of up to 75% per cycle, capped at SGD $7,700 per fresh cycle. As a result, embryo freezing becomes much more financially accessible for eligible married couples in Singapore.
Frequently Asked Questions
Conclusion
Choosing between egg freezing and embryo freezing is not just about success rates. It is about what fits your life, your relationship, your timeline, and your values. Embryo freezing gives you a slightly higher chance of success per transfer. Singapore also offers more financial support for eligible couples. Egg freezing gives you more flexibility and control, especially if you do not have a confirmed sperm source yet. There is no one-size-fits-all answer. The best next step is to talk with a fertility specialist who will listen to your needs. The sooner you have that conversation, the more options you will have.
References:
- Fraison, E., Huberlant, S., Labrune, E., Cavalieri, M., Montagut, M., Brugnon, F., & Courbiere, B. (2023). Live birth rate after female fertility preservation for cancer or haematopoietic stem cell transplantation: A systematic review and meta-analysis of the three main techniques; embryo, oocyte and ovarian tissue cryopreservation. Human Reproduction, 38(3), 489–502. https://doi.org/10.1093/humrep/deac249
- Kakkar, P., Geary, J., Stockburger, T., Kaffel, A., Kopeika, J., & El-Toukhy, T. (2023). Outcomes of Social Egg Freezing: A Cohort Study and a Comprehensive Literature Review. Journal of Clinical Medicine, 12(13), 4182. https://doi.org/10.3390/jcm12134182
- Marriage and Parenthood Schemes. (n.d.). Retrieved 12 August 2026, from https://www.healthhub.sg/support-and-tools/costs-and-financing/marriage_parenthood_scheme
- Wang, S. F., & Seifer, D. B. (2024). Age-related increase in live-birth rates of first frozen thaw embryo versus first fresh transfer in initial assisted reproductive technology cycles without PGT. Reproductive Biology and Endocrinology : RB&E, 22, 42. https://doi.org/10.1186/s12958-024-01210-0
Anna Haotanto is the Founder of Zora Health and a passionate advocate for women’s empowerment. Anna’s personal experiences with egg-freezing, PCOS, perimenopause and the challenges of fertility have fueled her mission to provide high-quality information, financing, and support to help women and couples navigate their fertility journeys with confidence. She is also recognised for her achievements in finance, entrepreneurship, and women’s empowerment, and has been featured in various media outlets. You can also follow her on Linkedin or Instagram.
