ICSI Treatment with a High Success Rate for Getting Pregnant

• ICSI (Intracytoplasmic Sperm Injection) is an advanced form of IVF where an embryologist injects a single healthy sperm directly into a mature egg to achieve fertilization.
• It is most often recommended for couples with severe male factor infertility, previous IVF fertilization failure, surgically retrieved sperm, or unexplained infertility.
• The main ICSI vs IVF difference is how fertilization happens: IVF lets sperm reach the egg on its own in a dish; ICSI bypasses that step by injecting one selected sperm directly into the egg.
• A full ICSI cycle typically takes 4–6 weeks and includes ovarian stimulation, egg retrieval, sperm injection, embryo culture, transfer, and a pregnancy test 10–14 days after transfer.
• Fertilization rates with ICSI are typically 60–80% of mature eggs, while live birth rates depend largely on the woman's age, egg and sperm quality, and embryo grade.
• Nakornthon Gift Fertility Center offers ICSI in Bangkok with reproductive medicine specialists, an Embryoscope Plus time-lapse incubator, and a reported 71.42% success rate with ICSI combined with NGS genetic screening.

For couples who have spent months or even years asking why pregnancy has not happened yet, the answer often comes down to a single biological step: fertilization. When sperm cannot reach or penetrate the egg on its own, conventional treatments may not be enough. ICSI (Intracytoplasmic Sperm Injection) is designed for exactly this challenge. It is one of the most effective assisted reproductive technologies available today, particularly for couples affected by male factor infertility, previous IVF failure, or age-related decline in egg or sperm quality.

At Nakornthon Gift Fertility Center, we provide ICSI as part of a comprehensive, personalized treatment pathway. Our care is supported by reproductive medicine specialists with over 20 years of clinical experience, advanced embryology laboratories, and modern technologies such as the Embryoscope Plus time-lapse incubator. This guide explains what ICSI is, who it is suitable for, how the procedure works, and what success rates you can realistically expect.

What is ICSI?

ICSI, or Intracytoplasmic Sperm Injection, is a laboratory technique performed as part of in vitro fertilization (IVF). Rather than allowing many sperm to surround an egg and fertilize it naturally in a dish, an embryologist selects a single healthy, motile sperm and injects it directly into the cytoplasm of a mature egg using a fine glass micropipette under a high-magnification microscope.

This precise approach bypasses the natural fertilization barrier, which is especially valuable when sperm count is very low, motility is poor, or the egg's outer shell (zona pellucida) is too thick for sperm to penetrate. Because only one healthy sperm is needed to fertilize each egg, ICSI makes biological parenthood possible for many couples who would otherwise have very limited options.

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Who is ICSI Suitable For?

ICSI (Intracytoplasmic Sperm Injection) is a highly specialized fertility treatment designed for couples facing specific challenges in conception. It is especially recommended in the following cases:

• Severe male factor infertility. This includes very low sperm count (oligospermia), poor motility (asthenozoospermia), or abnormal sperm shape (teratozoospermia).
• Azoospermia with surgically retrieved sperm. This applies to cases following vasectomy or obstruction, where sperm are retrieved directly from the testes through PESA or TESE procedures.
• Previous IVF fertilization failure. ICSI is often the next step when standard IVF has resulted in low or no fertilization in a prior cycle.
• Thick zona pellucida. When the outer shell of the egg is too dense for sperm to penetrate naturally, often related to maternal age, ICSI bypasses this barrier.
• Use of frozen or limited sperm samples. ICSI is suitable when sperm quantity is restricted, such as for patients who froze sperm before cancer treatment.
• Planned preimplantation genetic testing (PGT). ICSI is preferred when embryos need genetic screening for chromosomal or single-gene conditions, as it prevents extra sperm DNA from interfering with biopsy results.
• Unexplained infertility. ICSI may be considered when standard testing reveals no clear cause, but fertilization remains a concern.

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ICSI vs IVF: What's the Difference?

The most common question patients ask is about the ICSI vs IVF difference. Both procedures share the same early stages, including ovarian stimulation, egg retrieval, embryo culture, and embryo transfer. The two methods diverge at the critical moment of fertilization.

In conventional IVF, thousands of prepared sperm are placed in a dish with each egg, and fertilization happens naturally as one sperm penetrates the egg on its own. This works well when sperm parameters are normal. In ICSI, the embryologist takes a more active role. A single healthy sperm is selected and injected directly into each mature egg using a microscopic needle. This is particularly important when sperm number or quality is impaired.

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How Does ICSI Work? The Process Explained

ICSI (Intracytoplasmic Sperm Injection) is an advanced form of in vitro fertilization (IVF) designed to increase the chances of successful pregnancy, especially for couples experiencing infertility due to health issues related to sperm or egg quality. The ICSI procedure consists of several key stages that are carefully monitored to ensure optimal outcomes for ICSI fertility treatment.

Ovarian Stimulation

Beginning on day 2 or 3 of the menstrual cycle, daily hormone injections are used to stimulate the ovaries to produce multiple mature eggs rather than the single egg of a natural cycle. The goal is typically 8 to 15 mature eggs. Stimulation usually lasts 8 to 12 days, with the dose adjusted to your age, ovarian reserve, and response to treatment.

Monitoring Follicle Development

Throughout the stimulation process, the doctor will monitor the development of the follicles using ultrasound and hormone level assessments via blood tests every 4–5 days. Once the follicles have reached optimal size, a hormone injection is administered to mature the eggs in preparation for retrieval. This stage is crucial in the ICSI timeline, as proper timing is essential for successful egg maturation and retrieval.

Egg Retrieval

Once the eggs have matured, the patient must fast for at least 6 hours before undergoing egg retrieval. The procedure takes place 34–36 hours after the final hormone injection and involves retrieving the eggs through the vaginal wall. The collected eggs are then washed in culture medium and stored in the lab, ready for fertilization.

Semen Collection and Sperm Injectionc

On the day of egg retrieval, a semen sample is provided and processed in the laboratory to isolate the healthiest, most motile sperm. If azoospermia is present, sperm may be retrieved surgically through PESA or TESE. The embryologist then carefully injects one selected sperm into each mature egg using a microscopic glass needle. This is the defining step of ICSI.

Embryo Monitoring

Embryos are cultured in the laboratory (Blastocyst Culture) using the EmbryoScope Plus, an advanced incubator designed to monitor and support embryo development. This technology helps reduce the risks associated with traditional embryo culture, enhancing the efficiency and potential for growing stronger and safer embryos.

Embryos are cultured until they reach the blastocyst stage, approximately five days after fertilization, when they are most fully developed and robust. At this point, the embryos are transferred into the uterine cavity to allow implantation and the initiation of pregnancy, thereby increasing the chances of a successful outcome.

Before embryo transfer, preimplantation genetic testing (PGT) is performed to screen the embryos. This allows couples to select embryos that are genetically normal or free from chromosomal abnormalities for transfer, further improving the chances of a successful pregnancy per transfer cycle.

Embryo Transfer to the Uterus

Embryo transfer is a painless procedure using a fine plastic catheter to gently place the embryo into the uterus through the cervix under ultrasound guidance. There are two transfer options:

• Fresh cycle: The embryo is transferred within the same cycle, 3–5 days after egg retrieval.
• Frozen cycle: The embryo is cryopreserved and transferred in a subsequent cycle. Frozen embryos can be stored for 5–10 years.

Pregnancy Test

About 9–11 days after the embryo transfer, a blood test is scheduled to measure hormone levels and confirm pregnancy. At this stage, home urine pregnancy tests are not recommended due to the possibility of inaccurate results.

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Advantages of ICSI

ICSI (Intracytoplasmic Sperm Injection) is becoming an increasingly popular fertility treatment option for couples experiencing infertility. Beyond being a solution to help achieve pregnancy, ICSI offers several important advantages that make it a preferred method for many:

• Effective with very low sperm parameters. Even a single viable sperm per egg is enough to achieve fertilization.
• Compatible with surgically retrieved sperm. ICSI makes biological parenthood possible after vasectomy or in cases of obstructive azoospermia.
• Reduces the risk of total fertilization failure. This is a known concern in IVF cycles with poor sperm quality.
• Supports preimplantation genetic testing. ICSI minimizes the risk of extra sperm DNA contaminating embryo biopsy samples, which helps ensure accurate PGT results.
• Long-term gamete and embryo preservation. Eggs, sperm, and embryos can be cryopreserved for future cycles or family planning.

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Is ICSI Painful?

Most patients find ICSI well-tolerated rather than painful. Daily hormone injections during ovarian stimulation may cause mild bruising or temporary bloating, but the discomfort is usually manageable. Egg retrieval is performed under light sedation, so you should feel no pain during the procedure itself. Some women experience mild cramping or spotting in the 24 to 48 hours afterward, similar to menstrual discomfort. Embryo transfer is generally painless and does not require sedation. If you have concerns about pain management at any stage, your fertility specialist can adjust the plan to keep you comfortable.

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How Long Does ICSI Take From Start to Finish?

The entire ICSI (Intracytoplasmic Sperm Injection) process typically takes around 4–6 weeks from start to finish. This includes initial health check-ups, hormone blood tests, and around 8–10 days of ovarian stimulation injections.

Following that, the eggs are retrieved, and the male partner’s sperm is collected. Fertilization is then carried out using the ICSI technique. The embryos are cultured in the lab for about 5 days, during which time preimplantation genetic testing (PGT) may be performed.

Finally, the embryo is transferred back into the uterus. About 9–11 days after the transfer, a blood test is scheduled to measure pregnancy hormone levels and confirm if implantation was successful.

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What to do after ICSI treatment

After the embryo transfer in an ICSI cycle, it is recommended that the woman rest for at least 15–20 minutes. It is important to avoid sexual intercourse, vaginal douching, strenuous exercise, and heavy lifting, as these may interfere with the embryo implantation process.

Following your doctor’s instructions closely is essential during this period. If you experience any unusual symptoms, contact your doctor immediately for further evaluation.

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ICSI Success Rate: What to Expect

The ICSI success rate is best understood at two levels: fertilization and live birth. Fertilization rates with ICSI are typically 60 to 80 percent of mature eggs injected, which is reliably higher than conventional IVF when sperm quality is impaired. Live birth rates, however, depend less on the ICSI technique itself and more on a combination of factors. The most important are the woman's age, embryo quality, and uterine health.

To improve your chances, both partners are encouraged to follow a balanced diet, exercise moderately, avoid smoking and alcohol, and seek fertility evaluation as early as possible. This is particularly important if you are over 35 or have known reproductive health concerns.

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ICSI Treatment in Thailand at Nakornthon Hospita

Nakornthon Gift Fertility Center provides comprehensive ICSI treatment at our fertility center in Bangkok, combining specialist clinical care with internationally recognized success rates. Our reproductive medicine specialists bring over 20 years of academic and clinical experience to each treatment plan, supported by experienced embryologists and a certified sterile laboratory for embryo culture and fertilization.

With state-of-the-art technology and a comprehensive treatment plan, we offer tailored solutions to address your unique fertility needs. If you have any questions or would like to discuss your options, please don’t hesitate to contact us. We are here to support and guide you through every step of your fertility journey.

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Make an appointment with a fertility specialist today, or contact us for an initial consultation to discuss your options.

• Gift Fertility Center Hours: Open Daily, Monday to Sunday, 08:00 to 17:00
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• LINE Official: @nakornthoninter
• Tel: 02-450-9999 (Available 24 hours)

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