ICSI
ICSI, intracytoplasmic sperm injection, is one step inside an IVF cycle done a different way, rather than a separate treatment.
In a conventional cycle, eggs and sperm are left in a dish overnight to find each other. In ICSI an embryologist picks up one sperm in a glass needle finer than a hair and injects it into one egg. Everything else is identical. Same injections, same scans, same collection, same wait.
It was invented to solve a sperm problem, and it solves that problem very well. Where there is almost no sperm, or none of it can get through the shell of an egg unaided, ICSI is the difference between embryos and nothing.
It is a targeted tool. Where the sperm is fine and the challenge is the eggs, the tubes or unexplained infertility, conventional fertilisation in a dish does the same job, so the useful question is always what ICSI is fixing for you. Once you know that, the decision is easy.
At a glance
- Also known as
- Intracytoplasmic sperm injection, ICSI, IVF with ICSI
- Appointment time
- A few hours in the laboratory on collection day
- Time in clinic
- None
- Back to normal
- None beyond the cycle itself
- Whole process
- 4–6 weeks
- Typical cost
- $1,500–$3,000 on top of the cycle fee (United States, self-pay)
- Usually preceded by
- Fertility Testing, Semen Analysis
Figures reviewed .
On this page
Who it’s for
The indications are narrow and they are clear. A very low sperm count. Poor motility, so the sperm are there but not swimming. Sperm retrieved surgically from the testicle or epididymis, where there are only ever a handful and none of them have had to swim anywhere. A previous cycle where nothing fertilised at all, which the labs call total fertilisation failure.
And a small frozen-thawed sample, where there is not enough to inseminate a dish with and no chance of getting more.
Outside that list, conventional fertilisation usually does just as well. If a semen analysis is normal and the eggs have fertilised before, insemination in a dish does the same job for no extra fee. Where the obstacle is age, ovarian reserve or blocked tubes, the focus is on the eggs, which ICSI does not change.
There is no separate eligibility to clear. If you qualify for IVF you qualify for this, because it is the same cycle. What decides it is the semen analysis, sometimes repeated, and occasionally a karyotype or a Y chromosome test where the count is very low indeed.
Before you sign the treatment plan
Ask which finding on which test is the reason ICSI is on your plan. There is usually a specific number behind it, and knowing it means you can agree to the fee with confidence.
How it’s done
Nothing changes for you. The change is in the laboratory, a few hours after your eggs are collected, and you will never see any of it.
The sperm sample is washed and spun first, so the best-moving sperm can be picked out. Where there is none in the ejaculate, it is retrieved from the testicle instead, either that morning or from a frozen sample.
The eggs are stripped of the cloud of cells around them, which is the first point at which the embryologist can see how many are actually mature. Only mature eggs can be injected, and it is normal for a few in any batch not to be.
Then each egg is held still on a fine pipette. A single sperm is immobilised, drawn tail-first into the injecting needle, and the needle is pushed through the outer shell and the egg's membrane. The sperm is released inside and the needle withdrawn. It takes a practised embryologist a minute or two per egg.
The next morning each egg is checked for the two pronuclei that mean it fertilised normally. From that point the cycle runs exactly as a conventional one does. The embryos are cultured to day three or day five, and one goes back.
The week before egg collection
Sort out how and when the sperm sample is being produced, and where. Timing is tighter than it sounds on the day of collection, and having the plan settled in advance makes the morning run smoothly.
After ICSI
Physically there is nothing to recover from that the cycle itself would not have given you. The bloating, the cramping after collection, the day written off to sedation, all of that belongs to IVF and is unchanged by how the eggs were fertilised.
What changes is the phone call the next morning, which tells you how many eggs fertilised. Not every mature egg will, and that is normal.
Very few eggs fertilising, or none, is uncommon after ICSI, and it is not a sign the laboratory did badly. When it happens, ask whether the eggs looked mature and whether the sperm was the limiting factor, because the answer shapes the next cycle.
| Collection morning | Eggs collected under sedation. The sperm sample is produced or thawed and prepared in the laboratory. |
|---|---|
| Collection afternoon | Eggs stripped and assessed for maturity, then injected one at a time. Only mature eggs are used. |
| Next morning | The fertilisation call. Normally fertilised eggs show two pronuclei; some eggs do not survive injection. |
| Days 2–3 | Embryos divide and are graded. Identical to a conventional cycle from here on. |
| Day 5 | Blastocyst stage. Transfer now, or freeze what has made it and come back. |
| Two weeks later | A blood test. The measure that matters most from here is the pregnancy and live birth, not the fertilisation rate. |
The night before the fertilisation call
Decide with your partner who is taking the call and what you want to ask if the number is low. Whether the eggs were mature and whether any degenerated are the two questions that turn any result into useful information for the next step.
Risks and complications
The risk specific to ICSI is the egg itself. Pushing a needle through the membrane damages a small proportion of eggs, which then degenerate rather than fertilise. Good laboratories keep that low, and it is one of the things worth asking about.
There is also a subtler point. Conventional fertilisation lets the sperm compete to reach the egg, while ICSI relies on the embryologist choosing the best-looking, best-moving sperm. Where the sperm is very poor the DNA inside it may be affected too, which is worth discussing with your clinic.
The long-term data on children born after ICSI is broadly reassuring, and it is now decades deep. It is not quite identical to conventional IVF. Some studies report slightly higher rates of certain birth defects and imprinting conditions, on small absolute numbers. How much of that belongs to the technique rather than to the infertility behind it is genuinely unclear.
Where ICSI is indicated, that should not put you off. It is simply one more reason to use it where it is the right tool.
One inheritance point is concrete. Where a very low count has a genetic cause, ICSI can pass that cause to a son. That is what the karyotype and Y chromosome tests are for, and it is a conversation to have with a genetic counsellor rather than at the front desk.
ICSI results
Two different numbers get quoted, and it helps to keep them apart. ICSI reliably raises the fertilisation rate, the share of eggs that become embryos. The figure clinics quote sits somewhere around two thirds to three quarters of mature eggs, and where sperm was the obstacle it can take a cycle from nothing to something.
Live birth rate is a different matter. Once there are embryos, what happens next is decided by the egg and by the woman's age, and ICSI has no influence on either. Where there is a genuine male factor it lifts live birth rates, because it rescues cycles that would otherwise have failed at the first hurdle. Where there is no male factor, the evidence has not shown a better live birth rate than conventional fertilisation.
So a high fertilisation rate tells you the technique is working well in that lab, and the live birth rate tells you what it means for you. Ask about live births per cycle started, in your age band, and ask whether the ICSI cycles and the conventional ones differ.
Alternatives to ICSI
Conventional insemination, eggs and sperm together in a dish, is the alternative and for many couples it is the right one. It costs nothing extra and where the sperm is adequate the outcomes hold up.
Where the picture is uncertain, some laboratories will split a batch, injecting half the eggs and leaving the other half conventional. It answers the question for your particular combination in one cycle, and it is a good option to ask about if you are unsure whether you need ICSI.
Other options sit further back than the dish. If the sperm is very poor, treating the cause first, or using surgically retrieved sperm, or using a donor, are all different answers to the same problem. And if the constraint is the eggs rather than the sperm, the conversation that helps is about stimulation, number of cycles, or donor eggs.
IVF
Conventional IVF, where the ovaries are stimulated to produce a batch of eggs, the eggs are collected under sedation and mixed with sperm in the laboratory, and one embryo is transferred. The core treatment that the other pages in this group are variations on.
Best for: anyone whose tubes, sperm or time make natural conception unlikely, and who wants the treatment with the best odds per attempt
Combining ICSI with other treatment
Two things are commonly arranged around the same cycle. Surgical sperm retrieval, timed to the morning of egg collection so there is fresh sperm for the injections, or done earlier and frozen. And embryo freezing, because a cycle that fertilises well often produces more blastocysts than you transfer.
Embryo testing is the one that has to be decided in advance. Most laboratories insist on ICSI before they will biopsy an embryo, to avoid stray sperm confusing the result. So agreeing to testing often means agreeing to ICSI, whatever your semen analysis said. It is worth factoring into the decision and the budget.
ICSI cost
ICSI is usually priced as an add-on, so it is worth being clear about whether you need it. Most clinics charge it per cycle rather than per egg, on top of the cycle fee. It is a meaningful fraction of that fee, not a rounding error.
Sometimes it is already inside the headline number. Clinics in Thailand and parts of Europe often bundle it into the price. Ask whether it is included, and if it is, ask what a conventional cycle costs instead.
Ask two more things while you are there. Whether the fee is charged if the laboratory decides on the day not to inject, and whether a split cycle costs the same as a full ICSI one. Policies differ, so it is worth knowing both answers up front.
| Country | Self-pay | Public / insurance |
|---|---|---|
| United States Charged per cycle, not per egg; surgical sperm retrieval is separate again | $1,500–$3,000 on top of the cycle fee | Where a plan covers IVF it usually covers ICSI with a documented male factor |
| Thailand Ask what a conventional cycle costs before assuming the bundle is a saving | Often bundled into the cycle price | Self-pay only for international patients |
| United Kingdom Private clinics list it separately; the regulator publishes what the evidence supports | £1,000–£1,600 on top of the cycle fee | NHS-funded cycles include it where there is a male factor indication |
| Europe Bundling is common in Spain, Czechia and Greece | €800–€1,500, or included | Usually covered alongside IVF where the state funds cycles |
Choosing a clinic for ICSI
You are assessing a laboratory as much as a doctor. The injections are done by an embryologist you may never meet, and their skill is what you are choosing.
The number I would ask for first is what share of the clinic's cycles use ICSI. A clinic that uses both methods, matched to each couple, will have results for each to compare. Then ask for their fertilisation rate per mature egg injected, and their rate of eggs that degenerate after injection. Both are routinely recorded.
The question that reveals most is whether they would ever recommend conventional insemination for a couple like you. A clinic that can describe when it does not use ICSI is tailoring the plan to your case, which is exactly what you want.
At the consultation
Ask what happens if the sample on the day turns out better or worse than the analysis suggested, and who decides whether to inject. Knowing that the plan can change in the laboratory, and who decides, means the fertilisation call holds no surprises.
Clinics that do ICSI
Frequently asked questions
Does ICSI improve our chances?
Substantially, if sperm is the obstacle. If it is not, current evidence suggests conventional fertilisation does as well. The two numbers to keep apart are fertilisation rate and live birth rate. See results.
Is ICSI a different treatment from IVF?
No. It is the same cycle with the fertilisation step done by hand. Nothing about the injections, scans, collection or transfer changes. See how it's done.
Are children born after ICSI healthy?
The long-term data is decades deep and broadly reassuring, though not quite identical to conventional IVF on some measures. See risks.
Should we pay for it if our semen analysis is normal?
Ask what specific finding it is meant to address first. Where there is no male factor, conventional fertilisation usually does the same job without the extra fee. See who it's for.
Can we inject only some of the eggs?
Some laboratories will split a batch and do half each way, which answers the question for your own eggs and sperm in one cycle. See alternatives.