Intracytoplasmic Sperm Injection (ICSI)

Intracytoplasmic Sperm Injection (ICSI) is the most widely used and effective IVF method for addressing male-factor infertility. In this procedure, a single viable sperm cell is injected directly into the egg using a specialized microneedle. It significantly increases the chances of pregnancy in cases such as azoospermia, low sperm count, or poor motility.

At our clinic, the ICSI procedure is performed by expert embryologists using advanced laboratory technologies. Through this personalized approach, fertilization rates are maximized, and healthy embryo development is ensured.

What is ICSI?

ICSI is a microsurgical laboratory procedure where a single sperm cell is injected directly into the cytoplasm of an egg under a high-powered microscope. Unlike traditional In Vitro Fertilization (IVF), where sperm and egg are left to fuse naturally, ICSI does not wait for spontaneous fertilization. Instead, the embryologist selects the highest-quality sperm and manually places it inside the egg. This technique allows for successful outcomes even in couples with a very low probability of natural fertilization.

When is ICSI Recommended?

The ICSI method is the standard preference for the following infertility conditions:

• Post-MicroTESE: Patients where sperm is retrieved surgically due to azoospermia.

• Oligospermia: Severely low sperm count.

• Asthenospermia: Low sperm motility.

• Teratospermia: Poor sperm morphology (structural issues).

• Previous IVF Failure: Cases where traditional IVF failed to achieve fertilization.

• Frozen Samples: Patients using cryopreserved sperm.

• Genetic Screening: Used in conjunction with PGT for couples at risk of genetic disorders.

Key Differences: Classic IVF vs. ICSI

Advantages of ICSI

ICSI provides a path to biological parenthood in cases where only a few or weak sperm cells are available. The primary advantages include:

• Efficiency: Fertilization can be achieved with just one viable sperm cell.

• High Success Rates: Offers a solution for couples who cannot conceive naturally.

• Controlled Fertilization: The process is meticulously managed and monitored by the embryologist.

• Embryo Quality: Facilitates high-quality embryo development in optimized laboratory conditions.

• Compatibility: Can be safely performed with both fresh and frozen sperm samples.

How is ICSI Performed?

The ICSI procedure involves injecting a single sperm cell into an egg within a laboratory setting to achieve fertilization. This multi-stage process requires synchronized preparations from both the male and female partners.

The ICSI Step-by-Step Process:

1. Ovarian Stimulation: Hormonal medications are administered to the female partner to develop multiple eggs. This process lasts approximately 8–12 days and is monitored via ultrasound.

2. Egg Retrieval (OPU): Eggs are collected using ultrasound guidance 34–36 hours after the “trigger shot.” The procedure is performed under sedation or light anesthesia.

3. Sperm Preparation: The sperm sample is washed and processed in the laboratory to isolate the highest-quality cells. If sperm is retrieved via surgical methods like MicroTESE, it undergoes specialized preparation.

4. Microinjection: Under a high-powered microscope, an embryologist injects a single selected sperm cell into each mature egg using a specialized microneedle. This initiated the fertilization process.

5. Embryo Monitoring: The fertilized eggs are monitored in an incubator. For the first 3–5 days, the developing embryos are evaluated for quality and growth.

6. Embryo Transfer: One or two embryos showing the best development are placed into the uterus. The transfer typically occurs on either the 3rd or 5th day after fertilization.

Duration of the ICSI Process

The entire journey, from the start of ovarian stimulation to the embryo transfer, takes approximately 15–20 days. A pregnancy test is typically performed 10–12 days following the transfer.

Post-ICSI Recommendations:

• Physical rest is recommended immediately following the embryo transfer.

• Hormonal supports and prescribed treatments must be continued strictly as directed.

• Excessive stress and strenuous exercise should be avoided.

• It is crucial to wait until the scheduled date for a pregnancy test to ensure an accurate result.

Success Rates and Influencing Factors

With the ICSI method, the fertilization rate ranges between 70% and 85%, while the average pregnancy rate is between 40% and 60%. However, success varies based on several factors specific to the couple, with maternal age and embryo quality being the most decisive criteria.

Key Factors Influencing ICSI Success:

• Maternal Age: As age increases, egg quality naturally declines.

  • Under 35: 50% – 60% pregnancy rate.

  • 38+: 30% – 40% pregnancy rate.

  • 40 and older: 15% – 25% pregnancy rate.

• Egg Quantity and Quality: Retrieving a higher number of mature eggs increases the likelihood of obtaining high-quality embryos. Healthy eggs are the foundation of successful fertilization.

• Sperm Quality: While ICSI requires only a single sperm, selecting a morphologically normal and viable cell positively impacts development. This precision is even more critical when using sperm retrieved via TESE or MicroTESE.

• Laboratory Conditions and Expertise: ICSI is a delicate technique. Experienced embryologists, advanced incubator systems, and a high-tech laboratory infrastructure directly correlate with higher success rates.

• Uterine Receptivity and Transfer Technique: A suitable uterine environment increases the chances of implantation. The timing and surgical technique used during the transfer also affect the final outcome.

ICSI Success Rates – Statistical Overview

The following table provides a general overview of success rates based on maternal age. It is important to note that these figures are averages; every couple’s situation is unique, and a personalized success forecast can only be determined after a comprehensive clinical evaluation.

How to Maximize ICSI Success:

• Early Assessment: Evaluating ovarian reserve at the earliest possible stage.

• Specialized Centers: Ensuring MicroTESE and sperm cryopreservation are conducted in high-tech facilities.

• Extended Culture: Careful monitoring of embryo development, prioritizing the blastocyst stage when appropriate.

• Genetic Screening: Utilizing Preimplantation Genetic Testing (PGT) when indicated.

Post-ICSI: Embryo Transfer and Gestation

Following the ICSI procedure, fertilized eggs develop into embryos. The highest quality embryos are then selected for transfer into the uterus. This is the most critical and delicate phase of the entire treatment journey.

When is the Transfer Performed?

The transfer typically occurs on:

• Day 3 (Cleavage Stage) or

• Day 5 (Blastocyst Stage)

  The optimal day is chosen based on embryo development quality. While blastocyst transfers can offer higher implantation rates, they may not be the ideal choice for every patient.

The Transfer Procedure

The procedure is painless and does not require anesthesia. Using a thin catheter and guided by ultrasound, the embryo is placed precisely into the uterus. The process takes approximately 5–10 minutes, followed by a short rest period of 20–30 minutes at the clinic.

Life After Transfer: The Waiting Period

After the transfer, patients receive progesterone support to help the uterine lining remain receptive to the embryo. While you can return to your daily routine, certain precautions are necessary:

• Avoid Strenuous Exercise: Keep physical activity light.

• Stress Management: Maintain a calm and positive environment.

• Medication Compliance: Use all prescribed medications consistently.

The Pregnancy Test

The presence of pregnancy is measured via a Beta hCG blood test approximately 10–12 days after the transfer. Testing earlier than this can lead to misleading results; therefore, patience is vital during this window.