What is IMSI (Intracytoplasmic Morphologically Selected Sperm Injection)?
IMSI uses specialized lenses and software to magnify the sperm much more than usually used. The large-magnitude morphological selection of sperm allows the selection of the best sperm in real-time and its direct use in ICSI.
As a first step, the primary sperm selection process is done as done for standard ICSI. A few more sperms are selected than required. These sperm are now seen under High magnification, and their structure is carefully studied. Of these, only the structurally normal sperm is selected and used for fertilization with ICSI.
IMSI technique is a subjective analysis; the experience of our expert embryologist plays a crucial part in the success
Who is IMSI recommended for?
IMSI (Intracytoplasmic Morphologically Selected Sperm Injection) is especially beneficial in cases where sperm quality or structure affects fertilization. IMSI is recommended for couples with:
Low sperm morphology: A high proportion of abnormally shaped sperm
Low overall sperm quality
Previous ICSI failures where fertilization or embryo quality was poor
What are the steps involved in the IMSI procedure?
1. Sperm Selection
Semen samples are collected from the male partner and prepared for fertilization following the standard IVF-ICSI protocols.
2. Egg Retrieval
Eggs are retrieved from the female partner using a minor surgical procedure under sedation or anesthesia.
3. Low-Magnification Microscopy
Sperm are first examined under regular magnification to select a pool of sperm larger than needed for fertilization.
4. High-Magnification Microscopy
The selected sperm are then analyzed under high magnification, allowing detailed evaluation of their structure. Only sperm with completely normal morphology are chosen for fertilization.
5. Sperm Injection (ICSI)
The selected sperm are carefully injected into the egg using a fine needle in the standard ICSI procedure.
6. Embryo Culture
Fertilized eggs are cultured in the laboratory for a few days before the best quality embryos are transferred into the uterus.
Advantages of using IMSI
Enhanced Sperm Selection:
IMSI enables embryologists to select sperm with the best possible morphology, leading to better-quality embryos and improved chances of successful fertilization.Reduced Risk of Genetic Abnormalities:
By choosing sperm with ideal structural and genetic integrity, IMSI may help lower the risk of chromosomal or developmental abnormalities in embryos.Improved IVF Success Rates:
Research has shown that IMSI can result in higher fertilization and pregnancy rates compared to conventional IVF or ICSI, especially in couples with previous failed attempts.
Disadvantages of Using IMSI
Higher Cost:
IMSI involves the use of advanced high-magnification microscopes and skilled embryologists, making it slightly more expensive than standard ICSI or IVF procedures.Limited Availability:
Not all fertility centers are equipped with the necessary technology for IMSI, which may restrict access for some couples.
Why Perform IMSI?
IMSI (Intracytoplasmic Morphologically Selected Sperm Injection) is performed to maximize fertilization and pregnancy success rates in couples facing infertility, especially when male factor infertility plays a role.
By using advanced high-magnification imaging, IMSI allows embryologists to select the healthiest, most structurally normal sperm for fertilization.
This helps improve embryo quality, enhances implantation chances, and increases the likelihood of a healthy pregnancy outcome.
Is IMSI Better Than ICSI?
Both IMSI and ICSI are advanced micromanipulation techniques used during IVF, where a single sperm is injected into an egg.
However, IMSI provides an additional level of precision—it allows the embryologist to examine sperm under magnification up to 6000x, compared to 400x in standard ICSI.
This enhanced selection process helps identify sperm with optimal morphology and fewer DNA or chromosomal defects.
Clinical studies have shown that IMSI may offer higher fertilization, implantation, and pregnancy rates, particularly in cases of severe male factor infertility or previous IVF/ICSI failures.
