ICSI: Method Overview, Indications, and Clinical Relevance

Intracytoplasmic Sperm Injection (ICSI) is an advanced assisted reproductive technology (ART) method wherein a single sperm cell is directly injected into the cytoplasm of a mature egg using micromanipulation techniques. This method is used when conventional in vitro fertilization (IVF) is ineffective or impossible.

First successfully performed in 1992, ICSI revolutionized the treatment of severe male infertility.

How ICSI Is Performed
The procedure takes place in an embryology laboratory using an inverted microscope and micromanipulator.

Key stages include:

1. Ovarian stimulation and follicular aspiration – retrieval of mature oocytes (MII stage).
2. Sperm preparation – either from ejaculate or via surgical extraction (TESE, MESA).
3. Sperm selection – the embryologist selects the most morphologically and functionally viable sperm under high magnification.
4. Sperm injection – using a fine micro-needle, the sperm is injected into the egg cytoplasm.
5. Fertilization check – after 16–18 hours, the presence of two pronuclei confirms fertilization.
6. Embryo culture – embryos are cultured to the blastocyst stage, then transferred to the uterus or frozen for future use.

How ICSI Differs from Conventional IVF

ICSI is used strictly for specific medical reasons, including:
Male factor infertility:

• Oligozoospermia (low sperm count)
• Asthenozoospermia (poor motility)
• Teratozoospermia (abnormal morphology)
• Azoospermia (no sperm in ejaculate, requiring surgical retrieval)

Use of surgically retrieved sperm (TESE, MESA)

Female-related factors:

• Use of frozen eggs
• Failed fertilization in prior IVF attempts

Benefits of ICSI

• High fertilization rates, even with severely compromised sperm
• Optimal use of every egg, especially when few are available
• Effective with surgically retrieved sperm
• Suitable for immotile sperm and complex male infertility

Important: Despite its effectiveness, ICSI requires highly skilled professionals and state-of-the-art lab equipment. As with all ART methods, some embryological risks remain.

Conclusion
ICSI is not a substitute for IVF but a powerful complement, significantly expanding treatment possibilities. It enables couples with previously untreatable infertility to achieve parenthood.

Our clinic offers comprehensive consultations to assess indications, determine treatment strategies, and guide you through your reproductive journey.