What is ICSI?
ICSI (intracytoplasmic sperm injection) is a laboratory technique used inside an IVF cycle. Instead of letting sperm find and penetrate the egg on its own in a culture dish (conventional IVF), an embryologist selects a single healthy sperm and injects it directly into the cytoplasm of a mature egg using a fine glass needle, under a high-magnification microscope.
ICSI was developed to solve a single problem: severe male factor infertility, where there simply isn't enough functional sperm to fertilise eggs in a dish. For that situation it is genuinely transformative. For every other situation it is a tool used selectively — not a default upgrade.
How ICSI differs from conventional IVF
The stimulation, egg retrieval, embryo culture, and embryo transfer steps are identical to conventional IVF. The only difference is what happens in the lab on the day of retrieval:
- Conventional IVF places prepared sperm and an egg together in a culture dish and lets fertilisation happen naturally over the next few hours.
- ICSI picks one motile sperm and injects it into the egg. Fertilisation is then assessed the next morning.
For couples with normal sperm parameters, both methods produce equivalent blastocyst rates and live births. For severe male factor, ICSI is the only realistic option.
Who needs ICSI?
- Severe oligozoospermia — total motile count below 1–2 million.
- Severe asthenozoospermia — very low sperm motility.
- Severe teratozoospermia — less than 4% normal morphology.
- Surgically retrieved sperm — TESA, PESA, or micro-TESE samples from men with azoospermia.
- Prior fertilisation failure — eggs that didn't fertilise in a previous conventional IVF cycle.
- Frozen sperm with compromised parameters, especially after thawing.
- Use of testicular sperm from cancer survivors who banked tissue before treatment.
For couples without any of these indications, ICSI does not improve outcomes and may slightly reduce fertilisation efficiency in some studies. I do not use ICSI routinely.
How ICSI works — the laboratory step
- Egg retrieval — identical to a conventional IVF retrieval.
- Sperm preparation — the embryologist isolates the most motile, normal-appearing sperm from the prepared sample.
- Egg preparation — mature eggs are denuded of their surrounding cumulus cells to expose the egg for injection.
- Injection — one sperm is immobilised (tail squeezed) and aspirated into a fine pipette. The egg is held with a holding pipette; the injection pipette enters the cytoplasm and deposits the sperm. Each injection takes about a minute.
- Fertilisation assessment — about 16–18 hours later, embryologists check for the two pronuclei that confirm successful fertilisation.
- Continued culture and transfer — identical to conventional IVF from this point.
Success rates
Fertilisation rate with ICSI in good-quality eggs is typically 65–80%. Once fertilisation has occurred, embryo development and pregnancy rates are similar to conventional IVF. In other words: ICSI doesn't improve embryos — it just gets you across the fertilisation step when conventional IVF can't.
Costs and how it's priced
ICSI typically adds ₹20,000–₹40,000 to a standard IVF cycle in Hyderabad. At KIMS Fertility, the additional cost is set by the centre. If the indication is genuine, this cost is well-justified. If ICSI is being suggested without a clear indication, ask why.
Risks and considerations
- Small risk of egg damage during injection — modern laboratories see this in roughly 5–10% of injected eggs.
- Slightly increased risk of certain genetic conditions in offspring — most of this is attributable to the underlying severe male factor rather than the technique itself. Absolute risk remains low.
- Cost — meaningful, especially for cycles where the indication is borderline.
How I work
I use ICSI when there's a clear, evidence-based indication. I won't add ICSI to a cycle to "just to be safe" if sperm parameters are normal — the data don't support that, and the cost is non-trivial. When ICSI is indicated, we discuss the rationale, the slight added risk, and the expected fertilisation rate, so you know exactly what to expect.
Need to know if ICSI is right for your cycle?
A semen analysis and a conversation are usually enough to know whether ICSI is needed.
Book at KIMS Fertility (opens in a new tab)Frequently asked questions
The questions patients ask me most often about ICSI.
Is ICSI better than conventional IVF?
Not always. ICSI is better than conventional IVF when sperm parameters are too low for natural fertilisation in a dish — severe male factor or surgical sperm. With normal sperm, ICSI does not improve live-birth rates. It's a tool for specific indications, not an upgrade to every IVF cycle.
Does ICSI increase the risk of birth defects?
Large studies show a small absolute increase in birth defects with ICSI compared to natural conception — but most of that increase is attributable to the underlying severe male factor, not the ICSI technique itself. Absolute risk remains low.
Can ICSI work with very low sperm count?
Yes. ICSI needs only one viable sperm per egg, which is why it's used for severe oligozoospermia and surgically retrieved sperm. We have successfully fertilised eggs with sperm counts in single digits per millilitre.
How is ICSI priced relative to standard IVF?
ICSI typically adds ₹20,000–₹40,000 to a standard IVF cycle. Some clinics bundle ICSI into every IVF cycle by default. We use it only when there's an evidence-based indication.
What if no sperm is found in the semen sample?
This is azoospermia. Depending on cause, sperm can often be retrieved surgically from the testis or epididymis (TESA, PESA, or micro-TESE) and used for ICSI. Many couples with azoospermia have had successful pregnancies this way.
Does ICSI work with frozen sperm?
Yes. ICSI is often preferred with frozen sperm, especially when post-thaw motility is reduced. Outcomes are comparable to fresh-sperm ICSI.
Why do some clinics use ICSI for every IVF cycle?
Commercial reasons and reduced risk of fertilisation failure. But for normal sperm, conventional IVF produces equal blastocyst rates. Routine ICSI isn't best practice when sperm parameters don't justify it.
Can I choose ICSI even if it isn't medically indicated?
I'll discuss it honestly. ICSI in couples with normal sperm doesn't improve outcomes and carries some theoretical concerns. I won't refuse if you strongly want it after counselling, but I won't recommend it without an indication.