ICSI in Greece: What It Is, Who Needs It, and What to Expect

12 May ICSI in Greece: What It Is, Who Needs It, and What to Expect

For couples traveling to Greece for fertility treatment, or for those living in Greece and beginning to explore their options, the acronym ICSI tends to come up early in the conversation. It might appear on a doctor's recommendation letter, in a clinic brochure, or in a late-night search that leads to more questions than answers. What exactly is ICSI? Is it different from standard IVF? And who actually needs it?

This guide answers all of that – calmly, clearly, and accurately – drawing on current clinical practice and the legal framework that governs assisted reproduction in Greece.

What is ICSI?

ICSI stands for Intracytoplasmic Sperm Injection. In practical terms, it is a laboratory technique in which a single sperm cell is selected by an embryologist and injected directly into an egg using an extraordinarily fine glass needle, under a powerful microscope. The goal is to achieve fertilization – the moment when sperm and egg unite to begin the journey toward an embryo – in cases where that process cannot happen reliably on its own.

ICSI is not a separate fertility treatment that stands apart from IVF. It is, rather, a specific method of fertilization used within an IVF cycle. The stimulation of the ovaries, the egg retrieval procedure, the monitoring of embryo development, and the embryo transfer – all of these remain the same as in any IVF cycle. The difference lies entirely in how the egg and sperm are brought together in the laboratory.

When ICSI was first developed in the early 1990s, it was revolutionary. For the first time, couples dealing with severe male factor infertility – where the sperm count was too low, the sperm too slow, or the sperm morphology too abnormal for natural fertilization to occur – had a realistic path to biological parenthood. Today, ICSI is one of the most commonly performed fertilization techniques in reproductive medicine worldwide, including at leading fertility centers across Greece.

ICSI vs. Conventional IVF: What's the Difference?

Understanding the distinction between ICSI and conventional IVF helps couples make sense of why one is recommended over the other in specific situations.

In conventional IVF, eggs retrieved from the ovaries are placed in a dish together with a prepared sperm sample. The sperm are left to fertilize the eggs naturally – meaning each sperm must swim toward an egg, bind to its outer shell (called the zona pellucida), and penetrate it on its own. This approach works excellently when sperm quality and quantity are good, because many sperm are competing for each egg and the strongest are most likely to succeed.

ICSI removes that competition – and that obstacle. The embryologist examines the available sperm under high magnification, selects the one with the best characteristics, and injects it directly inside the egg. The sperm no longer needs to navigate or penetrate anything. The fertilization event is, in a sense, guided by skilled human hands and precision instrumentation.

This does not mean ICSI is inherently superior to conventional IVF. The evidence does not support routine use of ICSI for all couples. When sperm quality is normal, conventional IVF fertilization rates are equivalent, and choosing ICSI without a medical reason adds complexity and cost without a proven benefit. Good clinical practice – and Greek law – requires that assisted reproduction techniques be applied on the basis of medical indication, not as a default.

Who Needs ICSI?

The decision to use ICSI rather than conventional IVF is not arbitrary. It is made based on the clinical picture of each couple, with clear medical reasons guiding the recommendation. Under Greek Law 3305/2005 and Law 4958/2022, which govern assisted reproductive technologies in Greece, all such procedures require medical indication in line with Civil Code Article 1455.

The most established indications for ICSI are rooted primarily in the male partner's sperm profile.

Male factor infertility is the principal reason ICSI is recommended. When a semen analysis reveals a low sperm count (oligospermia), poor sperm motility (asthenospermia), or abnormal sperm morphology (teratospermia) – or a combination of all three, known as oligoasthenoteratospermia – the sperm may simply not have the capacity to penetrate and fertilize an egg without assistance. ICSI provides exactly that assistance, bypassing the obstacles that compromised sperm cannot overcome on their own.

Surgically retrieved sperm is another clear-cut case. When a man has no sperm in his ejaculate – a condition called azoospermia – sperm may sometimes be retrieved directly from the testicle or epididymis through procedures known as TESE (testicular sperm extraction) or PESA (percutaneous epididymal sperm aspiration). The quantities obtained are small and precious, and ICSI is the only practical fertilization method in these situations.

Previous fertilization failure in a conventional IVF cycle is also a strong indication. If eggs were retrieved in adequate numbers but none – or very few – fertilized, something in the egg-sperm interaction failed. ICSI in the subsequent cycle gives the embryologist direct control over that interaction and significantly reduces the risk of a repeat failure.

Egg donation cycles sometimes call for ICSI as well, particularly when the number of available eggs is limited or when the male partner's sperm quality gives cause for concern.

In cases where very few eggs are retrieved, ICSI may be preferred to maximize the fertilization potential of every available egg, since each one is too valuable to leave to chance.

Finally ICSI is preferred when sperm has increased DNA fragmentation or oxidation , which are not obvious on a simple sperm analysis .

The ICSI Procedure Step by Step

For couples embarking on an ICSI cycle in Greece, understanding what to expect at each stage can ease the anxiety that often accompanies the process. The overall journey follows the rhythm of a standard IVF cycle, with ICSI taking center stage in the laboratory.

The first stage is ovarian stimulation. Over approximately 10 to 14 days, the woman self-administers daily hormone injections (gonadotropins) to encourage the ovaries to develop multiple follicles – the fluid-filled sacs that contain eggs. The response is closely monitored through regular ultrasound scans and blood hormone tests, allowing the medical team to adjust the dose as needed and time the next step precisely.

When the follicles have grown to the optimal size, a trigger injection is given to complete egg maturation. Approximately 36 hours later, egg retrieval takes place. This is a short procedure – usually 15 to 20 minutes – performed under light sedation, during which a thin needle is guided by ultrasound to aspirate the fluid from each follicle. The eggs are immediately handed to the embryology team.

On the same day as egg retrieval, the sperm sample is prepared. This may be a fresh sample produced on the day, a previously cryopreserved sample, or surgically retrieved sperm.

The ICSI procedure itself occurs in the embryology laboratory, typically within a few hours of egg retrieval. The embryologist examines the sperm sample under high magnification, identifies the sperm with the most favorable morphology and movement, and immobilizes each selected sperm before drawing it into the injection needle. Under microscopic guidance, the needle is carefully inserted through the zona pellucida and into the cytoplasm of the egg, where the sperm is released. This process is repeated for each available egg.

The following day, the eggs are checked for signs of fertilization – the appearance of two pronuclei, one from the egg and one from the sperm, is the first confirmation that the process has worked. Over the next 3 to 6 days, the developing embryos are monitored as they progress through the cleavage stage and ideally reach the blastocyst stage, which carries the highest implantation potential.

Embryo transfer then takes place, most commonly on day 3 or day 5 after fertilization. A thin, soft catheter is passed through the cervix and one or two embryos are gently placed into the uterus. The procedure is straightforward, takes only a few minutes, and does not require anesthesia. Any embryos of sufficient quality that are not transferred can be cryopreserved for future cycles.

Two weeks after embryo transfer, a blood test measuring beta-hCG confirms whether a pregnancy has begun.

Risks and Limitations

ICSI has been performed safely for over three decades and has helped millions of couples worldwide. Nevertheless, like every medical procedure, it is not without risks and limitations – and understanding these is a necessary part of giving informed consent.

The most direct procedural risk is damage to the egg during needle insertion. In the hands of experienced embryologists working with state-of- the-art equipment, this happens rarely, but it cannot be entirely prevented. Eggs are delicate structures, and a small percentage may not survive the injection.

A broader concern that reproductive specialists continue to study is whether ICSI, by bypassing the natural selection process, introduces sperm with chromosomal or genetic abnormalities that would otherwise have been unable to fertilize an egg. For most couples, the risk this adds is very small. However, when a man's infertility has a genetic basis – such as Y- chromosome microdeletions or chromosomal rearrangements – that genetic cause may be passed to male offspring. This is why genetic counseling is offered to couples with male factor infertility before treatment begins.

In cases where ICSI is being considered alongside preimplantation genetic testing (PGT), it is important to know that PGT in Greece is not available on request. Law 4958/2022 specifies the medical criteria under which PGT is permitted, and access requires documented medical indications. A fertility specialist can clarify whether PGT applies in any individual case.

It is also worth saying plainly: ICSI addresses the fertilization hurdle, but it does not guarantee a pregnancy. Whether an embryo successfully implants depends on many factors beyond fertilization – including embryo quality, the receptivity of the uterine lining, and the woman's age. The fertility team will explain what outcomes are realistic based on each couple's specific situation.

ICSI at Pelargos IVF

Pelargos IVF operates as a fertility group, bringing together clinical expertise, personalized care, and a commitment to full transparency – both in terms of treatment decisions and costs. Every recommendation made by the Pelargos IVF team, including the choice of ICSI over conventional fertilization, is grounded in clinical evidence and made in compliance with Greek assisted reproduction law.

Fertilization procedures are carried out by experienced embryologists at our partner laboratory IOLife, a leading embryology facility equipped with advanced time-lapse incubation systems and microinjection technology. This partnership ensures that the delicate process of ICSI is performed under conditions designed to give each egg the best possible chance.

Patients coming to Pelargos IVF for ICSI in Greece benefit from a process that begins with a thorough consultation – reviewing all relevant test results, discussing the rationale for ICSI, and setting realistic expectations. Dr.

Harry Karpouzis and the team take time to ensure that every couple understands why a particular approach has been recommended and what the treatment will involve at each stage.

For international patients, Pelargos IVF offers coordination support to help navigate logistics, from timing cycles around travel schedules to ensuring continuity of monitoring with a local doctor. Greece is a recognized destination for fertility treatment in Europe, combining high clinical

standards with accessible costs compared to many Western European countries. For a full breakdown of what to expect financially, the Pelargos IVF team provides a detailed cost overview during your initial consultation, with no hidden fees and full transparency from the start.

If you would like to learn more about the team and the philosophy behind Pelargos IVF, you can read about .

When you are ready to take the next step, scheduling a consultation is straightforward:

Frequently Asked Questions

Is ICSI always necessary when doing IVF in Greece?

No. ICSI is recommended when there is a specific medical indication – most commonly related to sperm quality, surgical sperm retrieval, or previous fertilization failure. When sperm quality is normal, conventional IVF fertilization rates are equivalent to those achieved with ICSI, and the choice of fertilization method is made based on each couple's clinical picture.

What sperm count is needed for ICSI to work?

ICSI can be performed with extremely low sperm counts, and in some cases even a single viable sperm is sufficient. This is one of the most significant advantages of the technique for men with severe oligospermia or azoospermia whose sperm is retrieved surgically. The embryologist selects the best available sperm regardless of how few there are.

Can ICSI be used with donor sperm?

ICSI can be used with donor sperm when there is a clinical reason to do so – for example, if the number of eggs available is very small and fertilization rates need to be maximized. However, when donor sperm quality is high and sufficient in quantity, conventional IVF fertilization may be equally effective. The treating team will advise on the most appropriate approach.

How does ICSI in Greece compare to other European countries?

Greece maintains very high standards in assisted reproduction, operating under a rigorous legal framework established by Law 3305/2005 and updated by Law 4958/2022. Clinics in Greece are accredited and regulated by the National Authority for Medically Assisted Reproduction. In terms of cost, Greece typically offers significantly lower prices than countries such as the UK, Germany, or Switzerland, while maintaining comparable or equivalent clinical outcomes.

What happens if none of my eggs fertilize even with ICSI?

Total fertilization failure is uncommon but does occur in a small number of cycles. If it happens, the medical team will conduct a thorough review to identify possible causes – including egg quality, sperm quality on the day, and whether any technical factors may have contributed. The consultation after a failed cycle is an important step in planning the best approach for a subsequent attempt.

Does ICSI increase the chance of twins or multiple pregnancies?

ICSI itself does not increase the risk of twins. The risk of multiple pregnancies in IVF is primarily determined by the number of embryos transferred. At Pelargos IVF, the approach is guided by clinical evidence and Greek law, which restrict the number of embryos that may be transferred per cycle to minimize the risks associated with multiple pregnancy.