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What intrauterine insemination can and cannot get past, how a cycle runs, the per-cycle chance stated honestly, and how many attempts make sense before moving on.
Reviewed by Dr. Grishma Ranjangaonkar, MBBS, DGO, ICOG Fellowship in Gynecological Endoscopy · Eva WomanCare Clinic, Vashi
IUI is the least dramatic fertility treatment and the most misunderstood. It is quick, inexpensive and low-risk, and it works for a specific set of problems rather than for all of them. This guide explains which set, what a cycle involves, and what the numbers really look like.
Intrauterine insemination takes a semen sample, prepares it in the laboratory to concentrate the best-moving sperm into a small volume, and places that directly into the uterus through a fine catheter, timed to ovulation. It skips the cervix and the cervical mucus, and it puts a much higher concentration of motile sperm much closer to the egg than intercourse does.
What it does not do is fertilize the egg. That still happens inside the fallopian tube, the way it normally would. This is the single most useful thing to understand about IUI, because it explains everything about when it works and when it cannot.
The list below is the whole decision in one table. Read down the left column until you find the situation that matches your reports, not the one that matches how long you have been trying. IUI is chosen on the basis of what the tests showed, and offering it without those results is guessing with your months.
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Situation
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Is IUI reasonable
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Why
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An IUI cycle is short, mostly outpatient, and far lighter than IVF. Two visits and one procedure is a typical month.
A baseline scan at the start of the period confirms the ovaries are quiet. If the cycle is being stimulated, tablets or low-dose injections start around now. Unstimulated cycles skip the medication entirely and simply track your own follicle.
One or two scans watch the leading follicle grow. The target is usually one mature follicle, sometimes two. If three or more are growing, a good clinic will cancel the cycle rather than proceed, because the risk of triplets is real and not acceptable.
When the follicle reaches maturity a trigger injection is given, and the insemination is timed roughly 24 to 36 hours later. Some clinics use LH kits instead of a trigger in unstimulated cycles. Timing is the whole game in IUI, which is why the scans matter.
The male partner produces a sample, usually at the clinic, after two to five days of abstinence. The laboratory washes it, which separates the motile sperm from the seminal fluid, debris and non-motile cells. This step is not optional: unwashed semen must never be placed in the uterus, because the prostaglandins in it cause severe cramping.
Two minutes, no sedation, and similar to a smear. A soft catheter passes through the cervix and the prepared sample is placed in the uterine cavity. Mild cramping is common for an hour or so. You lie down for ten minutes and then go about your day. There is nothing to avoid afterwards.
Some clinics prescribe progesterone support in stimulated cycles. The pregnancy test is about two weeks later. As with IVF, testing early after a trigger injection can produce a false positive.
IUI has a modest per-cycle chance. That is not a criticism of it, because it is also quick, cheap and low-risk. But it is worth having the real number in mind before you start, so that a negative test reads as an expected outcome rather than a failure.
In one of the larger published series, 1,117 women went through 2,912 IUI cycles and a viable birth resulted from 9.4 percent of cycles. The same analysis found that success depended heavily on two things: the woman’s age, and the proportion of motile sperm in the prepared sample. Above the age of 43, the viable birth rate fell below one percent, which the authors described as futile care.
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What shifts the odds
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Direction
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The practical meaning
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IUI
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IVF
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The honest summary is that IUI is the right first step when the obstacle is small and the tubes are open, and a waste of months when the obstacle is large. It is not a lesser version of IVF. It is a different tool, and the mistake is using either one for a problem it does not solve. The IVF guide covers the other half of this decision in detail.
Myth
“You should lie down for an hour after an IUI.”
What is actually true
Ten to fifteen minutes is what is usually offered, and it is a courtesy rather than a treatment. The sperm are already inside the uterine cavity and are not going to fall out when you stand up.
Myth
“IUI is just an expensive version of trying at home.”
What is actually true
Not quite. It bypasses the cervix, and it places a prepared, concentrated sample of the best-moving sperm directly into the uterus at the right moment. That is a real advantage in specific situations. It is simply not a large advantage in every situation.
Myth
“If IUI fails twice, the next step must be IVF.”
What is actually true
Not necessarily. It depends on why you were doing IUI, what the tests showed, and how many cycles were planned. Twelve cycles are appropriate in some circumstances and four in others. Ask what course was planned rather than reacting cycle by cycle.
Myth
“Stimulated IUI is always better than unstimulated.”
What is actually true
Stimulation raises the chance somewhat and raises the risk of a multiple pregnancy at the same time. For donor insemination and for physical or psychosexual barriers, unstimulated cycles are what is recommended. Which one suits you depends on the reason you are having it.
None of the following raises the per-cycle chance dramatically. What they do is make sure the cycles you spend are the ones worth spending, and that you know what you are looking at when a cycle does not work.
Indications and the number of cycles offered follow NICE guideline NG257, updated in 2026. Per-cycle outcome figures are from a published cohort of 2,912 IUI cycles in 1,117 women (Journal of Assisted Reproduction and Genetics, 2020). This guide is general information and does not replace advice from your own doctor, who has your history and your results.
The other half of this decision: what a cycle involves, how to read a success rate, and which add-ons the evidence does not support.
The tubal test and the semen analysis that decide whether IUI is even an option.
For tracking your own cycle between treatment cycles, and for unstimulated timing.
If cycles are irregular, ovulation has to be sorted out before insemination timing means anything.
Two results decide it: whether at least one tube is open, and what the semen analysis shows. Both are quick, both are inexpensive, and having them before the first cycle rather than after the third is the difference between a planned course and months of guessing.
