ICSI – Intracytoplasmic Sperm Injection
Assisted Fertilisation in IVF
Intracytoplasmic Sperm Injection, commonly known as ICSI, is a specialised laboratory technique used as part of an IVF cycle. In this procedure, a single selected sperm is carefully injected into a mature egg under microscopic guidance.
ICSI may be considered when fertilisation through conventional IVF is expected to be difficult, particularly in selected cases of male factor infertility. It may also be advised when there has been previous poor or failed fertilisation in an IVF cycle, when surgically retrieved sperm is used, or when sperm availability is limited.
At Krishna IVF, ICSI is approached as a clinically guided assisted fertilisation method. The decision to use ICSI is based on medical evaluation, semen parameters, egg-related factors, previous treatment history, and discussion between the clinical and embryology teams.
Understanding ICSI
In conventional IVF, eggs and processed sperm are placed together in the laboratory, allowing fertilisation to occur without direct injection of sperm into the egg. This process depends on sperm count, motility, morphology, egg maturity, and the interaction between sperm and egg.
In ICSI, a single sperm is selected and introduced directly into the cytoplasm of a mature egg using micromanipulation equipment. This method helps overcome some fertilisation barriers related to sperm factors or previous fertilisation difficulty.
ICSI assists the fertilisation step of IVF. It does not guarantee fertilisation, embryo development, implantation, pregnancy, or live birth. These outcomes depend on several clinical and biological factors.
When ICSI May Be Considered
ICSI may be considered in selected situations, including:
- • Low sperm count
- • Reduced sperm motility
- • Abnormal sperm morphology
- • Previous fertilisation failure or poor fertilisation in an IVF cycle
- • Use of surgically retrieved sperm
- • Limited sperm availability
- • Certain cases involving frozen sperm samples
- • Selected cases where preimplantation genetic testing is planned
- • Severe male factor infertility
The need for ICSI should be assessed individually. It is not required for every IVF cycle and should not be viewed as a routine add-on unless clinically indicated.
How ICSI Fits Into an IVF Cycle
ICSI is performed within the broader IVF treatment pathway.
The female partner undergoes ovarian stimulation and monitoring to encourage the development of multiple follicles. When the follicles reach the appropriate stage, eggs are retrieved under ultrasound guidance, usually with anaesthesia or sedation.
The semen sample is processed in the laboratory. In some cases, sperm may be obtained through surgical retrieval, depending on the male partner’s diagnosis. A selected sperm is then injected into each mature egg using specialised micromanipulation equipment.
After injection, the eggs are observed for fertilisation. Fertilised eggs are cultured in the embryology laboratory, and embryo development is monitored over the following days. Based on clinical and laboratory assessment, embryo transfer or cryopreservation may be planned.
IVF and ICSI: Key Difference
The main difference between IVF and ICSI lies in the method of fertilisation.
In conventional IVF, sperm and eggs are placed together in a laboratory dish, allowing fertilisation to occur through sperm-egg interaction.
In ICSI, a single sperm is directly injected into a mature egg.
ICSI may be useful when sperm-related factors reduce the possibility of fertilisation through conventional IVF. However, ICSI is not automatically superior to IVF. The appropriate method depends on the couple’s clinical situation, semen parameters, egg factors, previous treatment history, and laboratory assessment.
ICSI and Male Factor Infertility
ICSI has an important role in selected cases of male factor infertility. It may be considered when semen analysis shows significant abnormalities in sperm number, movement, or structure.
It may also be used when sperm is surgically retrieved in conditions such as obstructive azoospermia or selected non-obstructive cases, depending on clinical feasibility and medical evaluation.
Male infertility should be assessed carefully. Semen analysis is an important starting point, but additional evaluation may be required in some cases to understand hormonal, anatomical, genetic, lifestyle, or medical factors that may influence fertility.
Krishna IVF Approach to ICSI
At Krishna IVF, ICSI is used as part of evidence-based assisted reproductive care where clinically appropriate. The approach focuses on patient evaluation, laboratory coordination, embryology standards, and clear counselling.
The treatment plan considers:
- • Medical evaluation of both partners
- • Semen parameters and male infertility assessment
- • Ovarian reserve and expected egg response
- • Egg maturity and laboratory findings
- • Previous IVF or fertilisation history
- • Embryology laboratory assessment
- • Patient counselling regarding benefits and limitations
Technology is used as a support to clinical care, not as an assurance of outcome. This is consistent with the institutional communication framework, which states that technology should be communicated as an aid to evidence-based reproductive care and not as a guarantee of outcomes.
Success and Limitations
ICSI can help achieve fertilisation in selected cases, especially where sperm-related factors are significant. However, fertilisation is only one stage of the IVF process.
Embryo development, implantation, pregnancy, and live birth depend on multiple factors, including:
- • Age of the female partner
- • Ovarian reserve
- • Egg quality
- • Sperm quality
- • Embryo development
- • Uterine factors
- • Previous reproductive history
- • Genetic and medical factors
- • Overall health of both partners
Patients should not interpret fertilisation rates as pregnancy rates. Individual counselling is necessary to understand the expected role of ICSI in a specific treatment plan.
Patient Counselling Before ICSI
Before proceeding with ICSI, patients should understand why the procedure is being advised and how it differs from conventional IVF. They should also be informed about what ICSI can address, what it cannot address, and how outcomes may vary.
Important counselling points include:
- • ICSI assists fertilisation but does not guarantee pregnancy
- • Not every IVF cycle requires ICSI
- • Egg quality and sperm quality both influence outcomes
- • Embryo development cannot be predicted with certainty
- • Additional evaluation may be required in some male infertility cases
- • The treatment plan should be individualised
Clear counselling helps patients make informed decisions and maintain realistic expectations during treatment.