IUI Explained: What to Expect from Intrauterine Insemination
A step between timed intercourse and IVF. Here's how IUI works, who it helps, and what the experience is really like.
IUI places washed, concentrated sperm directly into your uterus around ovulation. It's less invasive and less expensive than IVF, with success rates of 10-20% per cycle depending on your situation. IUI works best for mild male factor infertility, unexplained infertility, or when using donor sperm. It's often combined with ovulation medications to boost success.
What Is IUI?
Intrauterine insemination (IUI) is a fertility procedure where sperm is placed directly into the uterus using a thin catheter. This bypasses the cervix and gets more sperm closer to the egg at the right time.
Think of it as giving sperm a head start. Instead of swimming through the vagina and cervix, they're deposited right where they need to be—in the uterus, ready to travel to the fallopian tubes where fertilization happens.
Who Is IUI Good For?
- • Mild male factor infertility—low count or motility that's not severe
- • Unexplained infertility—all tests normal but not conceiving
- • Cervical issues—hostile mucus or cervical stenosis
- • Need for donor sperm—single women, same-sex couples
- • Ovulation problems—combined with medication (Clomid/letrozole)
- • Mild endometriosis—especially with medication
- • Blocked fallopian tubes—sperm can't reach the egg
- • Severe male factor—very low count/motility needs ICSI (IVF)
- • Severe endometriosis—IVF may be more effective
- • Diminished ovarian reserve—time may be better spent on IVF
- • Advanced maternal age (40+)—lower success rates; IVF often preferred
The IUI Process Step by Step
Success Rates
IUI success depends on many factors—age, diagnosis, whether medications are used, and sperm quality after washing:
- Natural cycle IUI: ~8-10% per cycle
- IUI + Clomid/letrozole: ~10-15% per cycle
- IUI + injectable medications: ~15-20% per cycle
- Donor sperm IUI (good prognosis): ~15-25% per cycle
Cumulative success over 3-4 cycles is more meaningful than single-cycle rates. If IUI is going to work for you, it usually works within 3-6 cycles.
Most doctors recommend 3-6 IUI cycles before moving to IVF. If you haven't succeeded after 3-4 well-timed IUIs with medication, the marginal benefit of additional cycles is low. At that point, IVF typically offers better odds—especially if you're over 35 or have been trying for a long time.
Cost
IUI is significantly cheaper than IVF:
- IUI procedure itself: $300-1,000
- Monitoring (ultrasounds, bloodwork): $200-500
- Medications (if used): $50-2,500+ depending on type
- Sperm wash: Often included, sometimes $200-300 extra
- Donor sperm (if applicable): $500-1,200 per vial
Total per cycle: typically $500-2,500 with oral medications, more with injectables. Compare to IVF at $15,000-25,000+ per cycle.
Frequently Asked Questions
Most women describe IUI as mildly uncomfortable—like period cramps—but not painful. It's quick (5-10 minutes) and doesn't require anesthesia. Some experience brief cramping during or after. If you've had painful Pap smears, mention this to your doctor beforehand.
Yes! Many doctors actually encourage intercourse the day of and after IUI—it can only help. There's no medical reason to abstain. Some couples find the timing takes pressure off; others find continuing intimacy helps emotionally.
IUI itself has minimal risks—slight chance of infection, minor spotting. The bigger risk comes from medications: multiple pregnancy (twins, triplets) is 10-20% with oral meds, higher with injectables. Careful monitoring helps reduce this risk. Ovarian hyperstimulation is possible but uncommon with oral medications.
Most clinics want to see at least 5-10 million motile sperm after washing. Below that, success rates drop significantly and IVF with ICSI may be recommended instead. Post-wash count is more important than the initial semen analysis numbers.
IUI is less invasive, cheaper, and a reasonable first step for many diagnoses. IVF has higher per-cycle success but costs much more and involves more procedures. Factors favoring skipping IUI and going straight to IVF: severe male factor, blocked tubes, diminished ovarian reserve, age 40+, long duration of infertility, or strong desire to minimize time trying.
The Bottom Line
IUI is a solid middle-ground treatment—more intervention than timed intercourse, less than IVF. It works well for mild male factor, unexplained infertility, and donor sperm cycles.
If you're considering IUI, go in with realistic expectations: 10-20% per cycle means it often takes a few tries. Give it 3-4 cycles before reassessing. And know that if IUI doesn't work, IVF is a logical next step—not a failure.
Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Discuss your specific situation with a reproductive endocrinologist to determine if IUI is appropriate for you.