IUI (Intrauterine Insemination): Process, Success Rates, and Costs

Before most couples reach IVF, many try a simpler, less expensive procedure first. IUI, short for intrauterine insemination, places washed sperm directly into the uterus around the time of ovulation. It removes some of the obstacles between sperm and egg, costs a fraction of IVF, and can be done in a brief office visit. For the right diagnosis, it is a reasonable first-line fertility treatment. For others, it adds time and expense without meaningful benefit. If you are anywhere in this process, know that it is normal to feel overwhelmed — the goal of this guide is to help you have a clearer, calmer conversation with your care team.

Below we cover who IUI is appropriate for, what a cycle looks like step by step, how success rates vary, what it costs in the US, and when most clinicians recommend moving on to in vitro fertilization. Every situation is individual, so use this as background for a discussion with a reproductive endocrinologist rather than as medical advice. If you are still in the early stages of evaluation, our female infertility overview and the broader medical conditions library are useful starting points.

What IUI Is and How It Differs from IVF

IUI is sometimes called artificial insemination, though the modern procedure uses laboratory-prepared sperm rather than the older approaches of decades past. According to the American Society for Reproductive Medicine (ASRM), sperm is placed past the cervix and into the uterus around the time of ovulation, shortening the journey to the fallopian tubes and increasing the chance that more sperm will meet an egg. After a semen sample is collected, the andrology lab “washes” it — a process that can take up to a couple of hours — to concentrate the motile sperm and remove seminal fluid, dead sperm, and debris. The prepared sample is then loaded into a thin, flexible catheter and deposited at the top of the uterine cavity, bypassing the cervix.

The contrast with IVF is significant. IUI relies on the body to do most of the work: ovulation happens in the ovary, fertilization happens in the fallopian tube, and implantation proceeds without lab intervention. IVF, by contrast, retrieves eggs surgically and fertilizes them in the lab. Per cycle, IUI succeeds at a modest rate that depends heavily on age and diagnosis, while IVF generally runs higher. But IUI is also far cheaper and much less invasive, which is why it is often tried first for suitable diagnoses.

Who IUI Helps

ASRM describes several situations where IUI is commonly used: unexplained infertility (often its most common use, typically combined with ovulation-stimulating medication), cervical factor issues such as scarring or an abnormal cervix that impede sperm passage, ejaculation problems (including retrograde ejaculation or difficulty achieving an erection), anovulation or irregular ovulation used alongside ovulation medications, fertility preservation using previously frozen sperm, and donor insemination for single people, same-sex couples, or when a partner has no sperm or a genetic concern. ASRM notes that for unexplained infertility, the pregnancy rate with IUI plus ovulation medication is roughly double that of no treatment.

IUI is generally not recommended when both fallopian tubes are blocked, when sperm parameters are severely abnormal (very low count or motility, or significant DNA fragmentation), or when there is significant disease of the female reproductive tract. For patients over 38 with unexplained infertility, many reproductive endocrinologists move directly to IVF because time matters and per-cycle IUI rates fall sharply with age. Your specialist can tell you which category your own diagnosis falls into.

The IUI Process Step by Step

An IUI cycle takes roughly two to three weeks from start to pregnancy test. Most cycles include some form of ovarian stimulation, though “natural cycle” IUI without medications is also an option for younger people with regular cycles.

Cycle preparation. Many clinics use an oral ovulation-stimulating medication such as letrozole or clomiphene citrate early in the cycle to encourage one or two mature follicles; injectable gonadotropins are sometimes used but raise the multiple-pregnancy risk. All of these are prescriber-directed — the specific medication, dose, and timing are chosen and monitored by your fertility team, and you should never adjust fertility medications on your own.

Monitoring. Roughly around the middle of the pre-ovulation window, transvaginal ultrasound and sometimes estradiol blood tests confirm follicle development. When a lead follicle reaches a mature size, patients either receive a trigger shot of hCG or wait for a positive at-home LH test to pinpoint ovulation.

The insemination. Roughly 24 to 36 hours after the trigger or LH surge, the sperm sample is collected, washed in the lab, and inseminated. The procedure itself takes only a few minutes, feels similar to a Pap smear, and requires no anesthesia. ASRM notes most patients feel no pain, though mild cramping or light spotting can occur. Many clinics ask patients to lie still for ten to fifteen minutes afterward, though this likely makes little difference to the outcome.

The two-week wait. A blood pregnancy test (beta hCG) is usually drawn about two weeks after insemination. Some patients use a home pregnancy test first, but the blood test is more reliable.

IUI Success Rates by Age and Diagnosis

Per-cycle live birth rates for IUI are modest, and it is important to read them as ranges that vary by clinic, protocol, and diagnosis rather than fixed numbers. In general terms, stimulated IUI often yields roughly 10 to 15 percent per cycle for people under 35, somewhat lower in the late 30s, and into the single digits (often around 2 to 8 percent) after age 40, reflecting the steep effect of age on egg quality. Donor-sperm IUI in otherwise fertile people tends to run toward the higher end of these bands. Your own odds depend on your specific diagnosis, so a personalized estimate from your reproductive endocrinologist is far more useful than any published average.

Three to four cycles are typically used to evaluate IUI’s potential. Cumulative pregnancy rates tend to plateau after the third or fourth cycle for most diagnoses, which is why many clinics — consistent with ACOG’s infertility guidance — recommend reassessing after three to four unsuccessful cycles. Continuing past that point usually adds little benefit and is a good moment to discuss whether IVF makes more sense.

What IUI Costs

IUI is one of the more affordable fertility treatments, but costs vary widely by clinic and region, so treat the following as estimates rather than quotes. A single cycle in the US often costs somewhere around $300 to $1,000 for the insemination procedure itself, plus monitoring (ultrasounds and bloodwork, which can add several hundred dollars per cycle), medications (oral letrozole or clomiphene are relatively inexpensive, while injectable gonadotropins are considerably more), and a trigger shot. Put together, a stimulated IUI cycle commonly lands somewhere in the low-thousands range out of pocket, though your total depends on the medications used and your clinic’s fees.

Insurance coverage is more common for IUI than for IVF because the price tag is lower. Many states with infertility mandates explicitly include IUI, and even without a mandate, some plans cover monitoring and oral medications under the standard gynecology benefit. Coverage rules vary significantly by state and employer, so verify your specific benefits before starting. Donor sperm adds roughly $1,000 or more per vial from a sperm bank, plus shipping and storage fees where applicable.

Risks and Side Effects

IUI is among the lowest-risk fertility procedures. The most common physical complaints are mild cramping during the insemination, light spotting afterward, and bloating from ovarian stimulation. Pelvic infection is uncommon thanks to sperm washing, and ASRM notes IUI does not increase the baseline risk of birth defects (which is about 2 to 4 percent whether a pregnancy is conceived naturally or through IUI).

The primary risk is multiple pregnancy. Ovulation-stimulating medications — especially injectable gonadotropins — can cause more than one follicle to mature, raising the chance of twins or, less often, higher-order multiples. Twin pregnancies carry meaningfully higher risks of preterm labor, preeclampsia, and gestational diabetes, which is one reason ovarian stimulation is carefully monitored. Many clinics will cancel a cycle or convert it to IVF if too many mature follicles develop. A less common risk of ovarian stimulation is ovarian hyperstimulation syndrome (OHSS), in which the ovaries swell and fluid shifts occur; severe OHSS is uncommon with typical IUI protocols but is a reason your team monitors your response. Report severe abdominal pain, rapid bloating, shortness of breath, or a sudden increase in weight to your clinic promptly.

When to Move On to IVF

Reasonable triggers for moving from IUI to IVF include: three to four unsuccessful IUI cycles, being 38 or older with unexplained infertility, severe male-factor infertility confirmed on a follow-up semen analysis, blocked or damaged tubes, significant endometriosis, or a diagnosis (such as recurrent pregnancy loss or a known genetic condition) that benefits from preimplantation genetic testing.

Some patients also pivot for time and emotional reasons. IUI’s per-cycle rates can feel slow when the underlying clock is ticking, and repeated unsuccessful cycles take a real emotional toll. A frank, compassionate conversation with your reproductive endocrinologist about realistic odds at your age and diagnosis is more useful than any fixed cycle rule.

Frequently Asked Questions

How many IUI cycles should I try before switching to IVF?

Most fertility specialists suggest reassessing after three to four IUI cycles, because the chance of success in later cycles tends to drop for most diagnoses. People over 38 may switch to IVF earlier given the steeper age effect on egg quality. The right number is individual — decide it with your specialist.

Does IUI hurt?

Most patients describe mild cramping during the insemination, similar to a Pap smear, lasting under a minute. Some cramping can persist for a few hours afterward, and bloating from stimulation medications is common. Significant pain is not typical, so tell your clinic if you experience it.

Can I do IUI without fertility drugs?

Yes. Natural-cycle IUI relies on your own ovulation without medications. It works best for younger people with regular cycles using donor sperm, or for couples with mild male-factor infertility. Per-cycle success rates are lower than with stimulation, but so is the risk of multiples.

How accurate is the timing for IUI?

IUI is timed to occur roughly 24 to 36 hours after the LH surge or trigger shot, when ovulation is most likely. Because sperm can survive in the female reproductive tract for a couple of days and the egg is viable for about 12 to 24 hours after ovulation, the timing window is somewhat forgiving as long as insemination happens within that day-and-a-half range.

Is IUI covered by insurance?

Sometimes. Coverage is more common for IUI than IVF, and several states have infertility mandates that include it, but rules vary widely by state and employer. Check your specific plan’s fertility benefits and any monitoring and medication coverage before you start a cycle.

The Bottom Line

IUI is a sensible first-line fertility treatment for the right diagnoses: mild male-factor infertility, unexplained infertility, ovulatory issues, cervical factor, and donor-sperm cycles. It is far less expensive and less invasive than IVF, but per-cycle success rates are modest and decline with age. Three to four cycles is generally enough to know whether IUI is going to work for you. If it does not, escalating to IVF preserves time and avoids stacking up expense on a path that has already plateaued. Whatever you decide, make the call together with a reproductive endocrinologist who knows your full history.