IVF With ICSI: What It Is, When It’s Recommended and How It Compares to Conventional IVF

IVF with ICSI involves injecting a single sperm directly into a mature egg rather than allowing fertilization to occur on its own in the lab. Fertility specialists may recommend it for male factor infertility, previous fertilization problems or other circumstances that could make conventional IVF less effective.

ICSI can improve the chance of fertilization in certain situations, but it does not guarantee pregnancy. Understanding how it fits into your fertility journey can help you evaluate your treatment options and whether surrogacy may eventually offer another path to parenthood.

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IVF With ICSI vs. Conventional IVF

IVF with ICSI and conventional IVF follow the same general treatment process through egg retrieval. The main difference is how fertilization occurs in the lab.

IVF With ICSI

With ICSI, an embryologist selects a single sperm and injects it directly into a mature egg.

Best Suited For: ICSI is often recommended for male factor infertility, previous fertilization failure or other situations where fertilization may be more difficult.
Fertilization: Direct injection can improve fertilization when sperm-related challenges are present, but higher fertilization does not guarantee pregnancy or live birth.
Advantages: ICSI can overcome certain barriers to fertilization and reduce the risk of poor or failed fertilization in appropriate patients.
Considerations: ICSI requires additional laboratory handling and typically adds to the cost of an IVF cycle.

Conventional IVF

With conventional IVF, mature eggs are placed with prepared sperm in the lab and fertilization occurs without direct injection.

Best Suited For: Conventional IVF may be appropriate when sperm quality and treatment history do not indicate a higher risk of fertilization problems.
Fertilization: Success depends on sperm being able to reach and penetrate the egg, with rates varying based on individual and laboratory factors.
Advantages: Conventional IVF requires less manipulation of the egg and avoids the additional laboratory procedure and cost of ICSI.
Considerations: It may be less appropriate when significant sperm-related concerns or previous fertilization failure increase the risk of poor fertilization.

When Is ICSI Recommended?

ICSI is typically recommended when there is a higher risk that conventional IVF may not result in fertilization. Your fertility specialist may consider it in situations involving:

Severe male factor infertility
Poor or failed fertilization during a previous IVF cycle
Surgically retrieved sperm
Previously frozen eggs
Certain cycles involving preimplantation genetic testing (PGT)
Other sperm or egg factors that may make conventional fertilization more difficult

Male Factor Infertility

ICSI is commonly recommended when sperm count, movement or other characteristics could make fertilization through conventional IVF less likely. These diagnoses may include:

Oligozoospermia: A lower-than-normal concentration of sperm in the semen.
Asthenozoospermia: Reduced sperm motility, which can make reaching and fertilizing an egg more difficult.
Teratozoospermia: A high percentage of sperm with abnormal shape or structure.
Azoospermia: No sperm are present in the ejaculate, which may require sperm to be surgically retrieved.

ICSI allows an embryologist to inject a single selected sperm directly into a mature egg, bypassing some of the steps sperm must complete during conventional fertilization.

Previous IVF Fertilization Failure

ICSI may also be recommended when few or none of the mature eggs fertilized during a previous conventional IVF cycle. In these cases, changing how fertilization occurs may help address sperm-egg interaction problems that contributed to poor fertilization.

Using ICSI in a future cycle allows the embryologist to place sperm directly into each mature egg. This can improve the chance of fertilization in some patients, although it cannot guarantee that an embryo will develop or result in pregnancy.

What Is Split Insemination?

Split insemination allows a fertility clinic to use both conventional IVF and ICSI within the same cycle. After egg retrieval, mature eggs are divided into two groups, with one fertilized conventionally and the other using ICSI.

A fertility specialist may recommend this approach when there is uncertainty about which fertilization method will work best, such as:

Borderline Semen Analysis: Sperm results may not clearly indicate whether conventional fertilization or ICSI is the better approach.
Unexplained Infertility: Testing may not reveal a clear reason for infertility, leaving uncertainty about how well sperm and eggs will fertilize.
First IVF Cycle: When there is no previous fertilization history, using both methods can provide more information about how the eggs and sperm interact.

For example, if several mature eggs are retrieved, the clinic may fertilize some conventionally and use ICSI for the others. Comparing the results can help reduce uncertainty and guide fertilization decisions in future IVF cycles.

Does ICSI Improve IVF Success Rates?

ICSI can improve the chance of fertilization when sperm-related challenges or previous fertilization problems are present. However, successful fertilization is only one step in an IVF cycle and does not guarantee pregnancy. After fertilization, several other milestones determine the outcome:

Embryo Development: A fertilized egg must continue developing into an embryo suitable for transfer.
Implantation: The transferred embryo must successfully implant in the uterus.
Pregnancy: Implantation must progress into an ongoing, healthy pregnancy.
Live Birth: A successful pregnancy must continue through delivery.

For this reason, ICSI may improve fertilization rates for certain patients without necessarily increasing their overall pregnancy or live birth rates.

Are There Risks or Downsides to ICSI?

ICSI is widely used in fertility treatment, but the additional laboratory procedure comes with considerations that conventional IVF does not.

Egg Damage: Injecting sperm directly into an egg requires delicate manipulation, and a small number of eggs may be damaged during the procedure.
Embryo Development: Successful fertilization does not mean every fertilized egg will continue developing into a healthy embryo suitable for transfer.
Genetic Considerations: When ICSI is used for severe male factor infertility, your specialist may recommend genetic testing to identify possible underlying causes.
Additional Cost: ICSI requires specialized laboratory work and generally adds to the cost of an IVF cycle.
Not Necessary for Everyone: Conventional IVF may remain appropriate when there are no significant sperm-related concerns or previous fertilization problems.

Your fertility specialist can help you weigh these considerations against the potential benefits of ICSI for your specific circumstances.

What Happens If IVF With ICSI Doesn’t Work?

If IVF with ICSI does not lead to healthy embryos or a successful pregnancy, your next step depends on where the difficulty is occurring. Your fertility specialist can evaluate whether sperm, eggs, embryo development or carrying the pregnancy may be contributing.

Sperm-Related Challenges: Donor sperm may be considered when sperm quality or genetic factors make creating healthy embryos difficult with your own sperm.
Egg-Related Challenges: Donor eggs may be recommended when egg quality, quantity or other factors continue to limit embryo development.
Pregnancy-Related Challenges: Surrogacy may become an option when healthy embryos can be created, but achieving or sustaining a pregnancy remains difficult or carrying would pose significant health risks.

Understanding the underlying cause can help you determine whether another IVF approach, donor gametes or gestational surrogacy offers the most appropriate next step.

Why Surrogacy May Be Recommended After Failed IVF

After unsuccessful IVF or repeated embryo transfers, deciding what comes next can be difficult. If healthy embryos are available but achieving or sustaining a pregnancy remains challenging, a fertility specialist may recommend gestational surrogacy.

Surrogacy may also be considered when carrying a pregnancy would pose significant health risks. If it becomes part of your path to parenthood, we can help make the transition more manageable with:

Thoroughly Screened Surrogates: Prospective surrogates complete medical history reviews, background checks and psychological screening before matching.
Faster Matching: Our nationwide recruitment helps us maintain an average surrogate match time of 1–6 months, so you can continue moving toward parenthood sooner.
Comprehensive Case Management: We coordinate with clinics, attorneys and other professionals, giving you experienced support throughout your journey.
Financial Protections: Our program includes protections designed to reduce certain financial risks if an unexpected disruption occurs.

After everything you have already invested in growing your family, our goal is to help you continue moving forward with greater support and stability.

Talk to American Surrogacy About Your Next Steps

After investing so much in IVF, you deserve to understand what moving forward with surrogacy could look like for your family. A specialist can help you explore our screening process, nationwide matching network and Limited Risk Program.

Fill out our online contact form to speak with a surrogacy specialist and take the next step towards parenthood.