For most couples, IUI is worth trying as a first step, but only under the right circumstances. The overall live birth rate per cycle is about 13%, and that number shifts dramatically based on your age, sperm quality, and whether you use fertility medications. The real question isn’t whether IUI works in general, but whether it makes sense for your specific situation, and how many cycles to attempt before moving on.
Realistic Success Rates by Age
Across all ages, IUI produces a live birth rate of roughly 12.9% per cycle. That sounds low, but it’s not far off from the 15 to 20% chance a fertile couple has during any given month of trying naturally. The difference is that IUI concentrates sperm directly where it needs to be, which can overcome several common barriers to conception.
Age is the single biggest factor. Women under 25 have a live birth rate of about 26.7% per IUI cycle. By age 38, that drops to around 9.7%. At 42, it’s roughly 5.7%. These numbers reflect the natural decline in egg quality over time, something IUI can’t compensate for because it doesn’t select or screen eggs the way IVF does.
How Many Cycles Before You Should Stop
IUI has a clear point of diminishing returns, and it comes sooner than many people expect. Live birth rates drop from about 15.3% in the first cycle to 7% by the third. Over 90% of all live births achieved through IUI with ovarian stimulation happen within the first two cycles. After three cycles, the cumulative pregnancy rate is around 30%, meaning roughly one in three couples will have conceived by that point.
Most fertility specialists recommend trying three to four cycles before reassessing. If IUI hasn’t worked after three or four attempts, the odds of it working on the fifth or sixth are substantially lower, and the money and time may be better spent on IVF. That said, each couple’s situation is different. If you’re under 35 and there’s a clear, mild cause for the delay in conception, a few extra cycles can still be reasonable.
What It Actually Costs
A single IUI cycle typically runs between $1,000 and $4,000 out of pocket, depending on how much monitoring and medication you need. The insemination procedure itself costs roughly $1,200 to $1,300, which covers sperm processing, facility fees, and the physician. Each monitoring ultrasound adds about $1,000. If your doctor prescribes a trigger shot to time ovulation precisely, that’s another $1,000 or so.
Three cycles of medicated IUI can easily total $6,000 to $10,000 before insurance. Some states mandate fertility coverage, which can dramatically reduce this. It’s worth checking whether your plan covers diagnostic monitoring or medications separately, even if it doesn’t cover the insemination itself. Compared to IVF, which typically costs $15,000 to $25,000 per cycle, IUI remains a significantly cheaper entry point.
Medications Make a Measurable Difference
Unmedicated IUI cycles (relying on your natural ovulation) have lower success rates than medicated ones. The type of medication matters, too. In a randomized trial of 657 IUI cycles, injectable hormones produced a live birth rate of 13.8% per cycle, compared to 8.7% for the oral medication clomiphene. That’s a meaningful gap, roughly 60% higher odds with injectables.
The tradeoff is cost and convenience. Oral medications are cheaper and easier to take, while injectables require daily shots for up to two weeks and more frequent monitoring appointments. Your doctor will typically start with the simpler option and escalate if needed.
Sperm Count Is a Make-or-Break Factor
IUI works by washing and concentrating a sperm sample, then placing it directly into the uterus. The number of motile sperm in that prepared sample is one of the strongest predictors of success. A large study of over 47,500 IUI cycles found a clear threshold: when the processed sample contained at least 9 million motile sperm, the clinical pregnancy rate was about 16.9% per cycle. Below that number, success rates dropped steadily.
The decline is steep at the lower end. With 2 to 4 million motile sperm, the pregnancy rate fell to about 10%. Below 1 million, it dropped to under 5%. At fewer than 250,000 motile sperm, only 2.4% of cycles resulted in pregnancy. There’s no hard cutoff where IUI becomes impossible (pregnancies have occurred with counts as low as 660,000), but the odds become increasingly unfavorable. If your partner’s post-wash count is consistently below 5 million, your doctor may suggest moving to IVF sooner rather than later.
The Risk of Multiples
The most significant medical risk of IUI isn’t the procedure itself, which is quick and carries almost no physical risk. It’s the chance of a multiple pregnancy when fertility medications stimulate more than one egg. With clomiphene, about 8% of IUI pregnancies are twins and 1.7% are triplets or higher. With injectable hormones, 11.2% are twins and 7.2% are triplets or more.
Twin and higher-order pregnancies carry increased risks of preterm birth, low birth weight, and complications for the mother. This is why monitoring with ultrasound is important during medicated cycles. If too many follicles develop, your doctor may recommend canceling the cycle to avoid a high-risk multiple pregnancy.
When IUI Probably Isn’t Worth It
Certain diagnoses make IUI unlikely to succeed, regardless of age or sperm quality. If you have blocked or damaged fallopian tubes, IUI won’t help because the sperm and egg still need to meet in the tube. IVF bypasses the tubes entirely. Moderate to severe endometriosis, significantly diminished ovarian reserve, and severe male factor infertility are also situations where skipping straight to IVF tends to produce better outcomes.
The age gap in success rates also becomes important context here. A study comparing over 3,600 IVF cycles to 2,700 IUI cycles in women aged 38 to 44 found that IVF produced live birth rates roughly 2.5 times higher than IUI across every age group. At 38, that meant 27.8% with IVF versus 9.7% with IUI. By 42, it was 10.4% versus 5.7%. For women over 38, especially those with unexplained infertility or diminished ovarian reserve, the math increasingly favors going directly to IVF rather than spending months on IUI cycles that are less likely to work.
What the Process Actually Looks Like
A full IUI cycle takes about four weeks from start to finish. You’ll begin with baseline monitoring around the start of your period, then take oral medication for about five days or injectable medication for up to two weeks. During that time, you’ll have one to three ultrasound appointments to track how your follicles are developing. When a follicle reaches the right size, you’ll either wait for your body’s natural hormone surge or take a trigger shot to induce ovulation.
The insemination itself happens 24 to 36 hours after that surge. The procedure takes only a few minutes: a thin catheter delivers the washed sperm sample directly into your uterus. Most people describe it as similar to a Pap smear, with mild cramping. You can return to normal activities the same day. Two weeks later, you take a pregnancy test. That two-week wait is, for many people, the hardest part of the entire process.
The Bottom Line on Value
IUI is worth it as a first-line treatment for couples where at least one fallopian tube is open, sperm counts are in a workable range (ideally above 9 million motile after washing), and the woman is under 38. Under those conditions, two to three medicated cycles give you roughly a 30% cumulative chance of pregnancy at a fraction of IVF’s cost and physical demands.
It becomes harder to justify when you’re over 40, when sperm counts are very low, or when you’ve already completed three unsuccessful cycles. At that point, continuing with IUI means spending more money on a treatment with rapidly declining odds. The transition to IVF isn’t a failure. It’s a recognition that your situation calls for a more powerful tool. The couples who get the most value from IUI are those who go in with realistic expectations, a clear plan for how many cycles to try, and an agreed-upon point at which they’ll reassess.