Treatment guide
ICSI and the embryology laboratory
A single sperm injected into each egg — and the lab conditions that quietly decide cycle outcomes.
Written and reviewed by the MyBabyBridge editorial team · Last reviewed · 3 sources · General information, not medical advice. Our editorial standards
What it is
ICSI, intracytoplasmic sperm injection, is the injection of one selected sperm directly into a mature egg. It was developed for severe male-factor infertility and is very effective for that purpose. It is now used in most IVF cycles in the United States, including many without male factor, where ASRM finds it does not improve live birth rates. Behind ICSI sits the laboratory itself: air quality, temperature and pH stability, media, incubator discipline, and the skill of individual embryologists. These are rarely discussed with patients and matter enormously.
Who it is usually for
Clearly indicated for male-factor infertility: low sperm count, poor motility or morphology, or surgically retrieved sperm. Without male factor, ASRM says it may help after poor or failed fertilization with conventional IVF, when eggs were previously frozen, or when embryos will be tested for a single-gene condition (PGT-M), where stray sperm could affect the result. ASRM does not recommend routine use without male factor, including for unexplained infertility, low egg numbers, older age, or chromosome screening (PGT-A) alone.
Unfamiliar term? See the fertility glossary.
What happens, step by step
- Step 1
Sperm selection
An embryologist selects an individual motile sperm under high magnification.
- Step 2
Injection
The sperm is injected through the egg's outer shell into the cytoplasm using a micromanipulator.
- Step 3
Fertilization check
Normal fertilization is confirmed roughly 16 to 18 hours later.
- Step 4
Culture
Embryos are grown in controlled incubators to the blastocyst stage, sometimes with time-lapse imaging.
Time and cost
How long it takes
Performed on the day of retrieval; it does not lengthen the cycle.
What it typically costs
ASRM notes that ICSI adds to the cost of IVF. Ask whether it is included in your quote or billed separately, and whether you need it at all.
Prices vary widely by clinic and region. Get an itemised estimate in writing — see the IVF cost guide.
Risks and limits
- Added cost, and possibly a lower chance of a live birth, when used without male factor
- A small increase in the risk of some birth defects has been reported with ICSI; whether this applies without male factor is unclear
- Where male infertility has a genetic cause, it can be passed to sons, so genetic counselling may be offered
- No technique compensates for poor egg or sperm quality
- Laboratory conditions and staffing vary between clinics and are difficult for patients to assess
What to ask your clinic
- Is ICSI indicated in my case, or is it your default for everyone?
- What is your fertilization rate with and without ICSI?
- How many embryologists do you employ, and who performs the procedure?
- What is your blastocyst conversion rate?
- Is your laboratory accredited, and by whom?
Ask for the answers in writing, alongside itemised costs.
Sources
- Intracytoplasmic Sperm Injection for Nonmale Factor Indications: A Committee Opinion (2026) — American Society for Reproductive Medicine
- In Vitro Fertilization (IVF) — Cleveland Clinic
- Treatment Add-Ons and Their Evidence Ratings — Human Fertilisation and Embryology Authority
Thinking about ICSI and the embryology laboratory?
Tell us where you are. We will review it and reply by email with general next-step information.