Understanding IUI: Who It May Help and What to Expect

Educational overview. Whether IUI is appropriate depends on the full fertility evaluation. This article does not replace individualized medical advice.

What IUI is

Intrauterine insemination (IUI) places a prepared sperm sample through the cervix and into the uterus near the time of ovulation. The laboratory washes the sample to concentrate motile sperm and remove most seminal fluid.

When it may be considered

IUI may be discussed for selected patients with unexplained infertility, ovulatory disorders treated with medication, some problems with sperm delivery, cervical factors, or the use of donor sperm. At least one fallopian tube generally needs to be open, and the sperm sample must contain an adequate number of usable motile sperm. Severe tubal disease, significant sperm abnormalities, or some other diagnoses may make another treatment more appropriate.

What a cycle can involve

1. Baseline review. The team confirms the treatment plan and may use ultrasound or laboratory testing.
2. Ovulation planning. A cycle may be natural or may include medication. Monitoring and timing are individualized.
3. Sperm preparation. A fresh or frozen sample is processed in the andrology laboratory.
4. Insemination. A thin catheter delivers the prepared sample into the uterus. The procedure usually takes only a few minutes; mild cramping or light spotting can occur.
5. Follow-up. The team gives medication and pregnancy-testing instructions specific to the cycle.

Benefits and limits

IUI is less invasive than IVF, but it cannot correct every cause of infertility. Success varies with age, diagnosis, sperm characteristics, medication use, and the number of cycles attempted. When ovarian-stimulation medication is used, the principal avoidable risk is multiple pregnancy; careful monitoring and cycle-cancellation guidance matter.

Questions to ask

• Why is IUI reasonable for my diagnosis?
• Will this be a natural or medicated cycle?
• How will the team reduce multiple-pregnancy risk?
• How many cycles should we consider before reassessing?

Source

ASRM/ReproductiveFacts: Intrauterine insemination patient fact sheet

Last reviewed: September 2026.