Why didn't my egg fertilise after ICSI ?
You have done everything right. You followed your doctor's advice, took the medications, watched the scans, and held onto hope after every injection. When the news comes that your egg did not fertilise, even after ICSI, it hits like a punch to the stomach. You wonder, "How can I do everything, have a good egg, good sperm, do ICSI, and still get nothing?" If you are asking yourself these questions, you are not alone. Many couples, especially women in their forties, find themselves in this heartbreaking situation, confused and searching for answers.
When Fertilisation Fails Despite Good Eggs and Sperm
Let us look at a real patient's question:
We had our first cycle in July this year with ICSI as I had just turned 45 years and my partner is the same age. We had a very good grade 1 embryo put back but it did not implant. So we have just now had another cycle on the 24th November this month, I had a mature egg follicle size was 19 mm, sperm was good, they did ICSI again but this time they said it did not fertilise? They told us the egg was good and the sperm was good but it just did not happen. How can I have a good egg and sperm but did not fertilise using ICSI? I could understand it if the egg was not a good one or sperm, and how come we had a grade one embryo few months ago and now nothing? Does this sound right to you? ICSI with a good egg good sperm but no fertilisation I cannot get my head around. I have been so upset.
If any of this sounds like your experience, you are not alone in your confusion or your pain. Failed fertilisation after ICSI, especially when everything else "looks good," feels deeply unfair.
Why Does ICSI Sometimes Not Work?
Let us be honest: ICSI (intracytoplasmic sperm injection) is a powerful tool in fertility treatment. By directly injecting a single sperm into a mature egg, ICSI helps many couples overcome male factor infertility and even unexplained infertility. But it is not a guarantee. Even when both the egg and sperm appear healthy under the microscope, fertilisation can still fail.
For women over 40, this is unfortunately common. Here is why:
- Egg "Appearance" Can Be Deceiving: An egg may look good in the lab, but as women age, the internal machinery of the egg, the mitochondria, which provide energy for cell division, may be worn out. These tired mitochondria cannot always support the complex process of fertilisation and early embryo development.
- Hidden Factors: There is no current technology that can check the "energy" or competence of an egg's mitochondria before fertilisation. So, a mature-looking egg might still lack the power to activate and divide, no matter how perfect the sperm or precise the ICSI technique.
Many couples are surprised to learn that, statistically, about 75-80% of mature eggs will fertilise after ICSI. This means some cycles will not result in any fertilised eggs, even when everything seems to be on track.
It Is Not Your Fault: The Emotional Struggle of "Doing Everything Right"
No one prepares you for this kind of disappointment. You may blame yourself, your partner, or even your clinic. The truth is, sometimes the science just meets its limits. The emotional impact is real: anger, confusion, sadness, and even shame.
Fertility struggles do not mean you have failed, they mean you are human, and real biology is not always predictable.
At Malpani Infertility Clinic, we see patients face these moments with courage, even when they feel utterly lost. Our job is to help you find clarity, not false hope or empty reassurances. If you are over 40, the chance of failed fertilisation is higher simply because the eggs have aged, and this is a biological reality no lab can fully overcome.
What Can Be Done After Failed Fertilisation?
When fertilisation fails after ICSI, the options are limited. Unlike cycles where eggs and sperm are simply mixed (conventional IVF), you cannot "try again" with the same eggs, because a sperm has already been injected.
However, there are still things you and your doctor can consider for future cycles:
- Review Stimulation Protocols: Sometimes, a different approach to medication can help the ovaries produce better-quality eggs, or more eggs, increasing the chances of success.
- Focus on Egg Quality: For older women, quantity is not as important as quality. Mini IVF or gentle stimulation protocols may help recruit eggs that are naturally more competent, rather than relying on high doses of medication.
- Consider Egg Donation: For some women in their mid-40s, using younger donor eggs may be the most effective way to achieve pregnancy, though this is a deeply personal decision.
The most important thing is not to lose hope. Many patients who have one failed cycle go on to succeed in future cycles, sometimes with a few adjustments. The journey may be longer and harder than you ever imagined, but progress is possible.
of mature eggs typically fertilise after ICSI. Some cycles yield no fertilisation, especially in women over 40, due to egg quality.
Making Sense of the "Good Embryo" One Cycle, "No Fertilisation" the Next
It can be incredibly confusing to get a top-quality embryo in one cycle and then no fertilisation in the next, even when your test results look similar. This is not your fault, and it does not mean your body "missed something." Egg quality can fluctuate from cycle to cycle, especially as we age. One month, you might have a slightly better egg; the next, a weaker one. The process is sensitive to every small variable in your biology.
What matters most is how your body responds to stimulation, the number of mature eggs retrieved, and the silent, unseen quality of each egg. No test, not even AMH or FSH, can reliably predict which eggs will fertilise or which embryos will grow. Only by trying can we see the actual outcome.
How Malpani Infertility Clinic Can Support You
At Malpani Infertility Clinic, we believe in giving you honest answers, not just statistics. We will review your cycle details step by step, explain possible reasons for failed fertilisation in your specific case, and help you make informed choices about your next steps. Our gentle, no-nonsense approach means we will never push you toward treatments that are not right for you, but we will always support you in making the best possible decision for your future.
If you are struggling with repeated failed cycles, or just want to understand your options, consider reaching out to Dr. Malpani for a personal review. Sometimes, a fresh look at your cycle and your unique biology can reveal new paths forward.
Frequently Asked Questions
Q: Why did my egg not fertilise even after a good ICSI cycle?
A: Even when the egg and sperm look good, egg quality, especially the energy within the egg, can limit fertilisation, particularly in women over 40. The lab cannot see or fix this internal problem.
Q: Can anything be done if fertilisation fails after ICSI?
A: Once ICSI is performed, you cannot try again with the same eggs. For future cycles, your doctor may suggest adjusting medications, using different protocols, or considering donor eggs if you are open to it.
Q: Is failed fertilisation after ICSI common in women over 40?
A: Yes. As women age, egg quality drops, and the risk of failed fertilisation increases, even when eggs look mature and healthy.
Q: Why did I get a good embryo in one cycle and nothing in the next?
A: Egg quality can change from cycle to cycle, especially as we age. One cycle might produce a stronger egg, another a weaker one. This is not something you or your doctor can control completely.
Q: How do I know if my clinic is doing everything properly?
A: Ask your clinic to explain their lab procedures and your medical details step by step. A good clinic will be transparent and help you understand what happened and what can be done next.