Does ICSI increase the risk of birth defects?

The absolute risk of birth defects in ICSI children is extremely low (around 3-4% compared to 2-3% in natural births). Most studies show that this slight increase is related to the underlying parental infertility issues rather than the ICSI procedure itself.

Is ICSI mandatory for all IVF cycles?

No. If the male partner has completely normal semen parameters and there is no history of unexplained fertilization failure, standard IVF is generally preferred as it allows natural selection of the sperm in the dish.

Laboratory Embryology Guide

Standard IVF vs. ICSI: Demystifying Fertilization

Medical Review by Jivanjeet Clinical Advisory Board — Updated June 2026

The Core Difference

In standard **In Vitro Fertilization (IVF)**, eggs and sperm are placed together in a petri dish in a laboratory, and fertilization happens naturally—the sperm must swim to the egg, bind to its shell (zona pellucida), and penetrate it.

In **Intracytoplasmic Sperm Injection (ICSI)**, the embryologist bypasses natural penetration. Under a high-powered microscope, a single healthy, active sperm is selected, loaded into an ultra-thin glass needle, and injected directly into the cytoplasm (center) of the mature egg.

When is ICSI Necessary?

ICSI was developed in the early 1990s specifically to treat male factor infertility. Today, it is recommended in the following scenarios:

Severe Male Factor Infertility: Low sperm count (oligozoospermia), poor motility (asthenozoospermia), or high rates of abnormal shape (teratozoospermia).
Surgical Sperm Retrieval: When sperm must be retrieved directly from the testicles (TESA/PESA) due to an obstructive block (azoospermia). Retrieved sperm are often immature and cannot penetrate the egg on their own.
Pre-implantation Genetic Testing (PGT-A/PGT-M): In standard IVF, thousands of sperm attach to the outer shell of the egg. When taking a cell biopsy for genetic screening, these extra sperm can contaminate the sample, yielding false DNA profiles. ICSI prevents this.
Unexplained Fertilization Failure: If a couple has undergone standard IVF previously and few or no eggs fertilized.

Success Rates & Attrition

ICSI has an average fertilization rate of 70% to 80%. This means out of 10 mature retrieved eggs, 7 or 8 will normally fertilize.

However, couples must prepare for standard biological attrition:

Not all retrieved eggs are mature (only mature eggs can undergo ICSI).
Not all fertilized eggs will grow normally.
Only about 30% to 50% of fertilized embryos reach the blastocyst stage (Day 5/6).

Additional Cost of ICSI in India

Because ICSI requires high-tech micromanipulators, micro-needles, and highly skilled laboratory staff, clinics charge an add-on fee of **₹30,000 to ₹50,000** on top of the standard base IVF cycle package.