IUI Gender Selection
Last reviewed 2026-10-27
IUI with sorted sperm is sold as the affordable way to choose, and it is the option where the arithmetic most often disappoints. You combine a sorting step that shifts the odds rather than deciding them with an insemination procedure whose pregnancy rate per cycle is modest. Repeat cycles accumulate cost quickly, and even a successful one carries a real chance of the sex you did not choose.
What IUI with sex selection involves
- A sperm sample is sorted
By flow cytometry or an albumin gradient, producing a sample enriched for one sex. Neither method removes the other sex from the sample — they change its proportion.
- Ovulation is timed, often with medication
Monitoring and sometimes a trigger injection, so the insemination lands in the right window.
- The prepared sample is placed in the uterus
A short outpatient procedure, no anaesthetic. From here it is an ordinary conception attempt — nothing further is selected or tested.
Why the numbers rarely work
Two independent probabilities sit in series, and people tend to think about only one of them.
- Will this cycle produce a pregnancy at all? IUI pregnancy rates per cycle are modest and fall with age. Most cycles do not result in a pregnancy. This is the term that drives the number of attempts.
- If it does, will the child be the sex you selected? Sorting gives you better than even odds, not an answer. A meaningful share of successful cycles end with the other sex.
Multiply them and a single IUI attempt has a fairly low chance of delivering the specific outcome you are paying for. Multiply the cost by the number of attempts that implies, and the comparison with one IVF cycle including embryo testing is often much closer than the headline prices suggest — sometimes the wrong way round.
The honest way to frame the choice: IUI buys you more chances at a worse question; IVF with testing buys you fewer chances at a better one. If the sex genuinely matters to your decision, you are buying an answer, and IUI does not sell one.
When IUI does make sense
It is not a worthless option — it is a mismatched one for this goal. IUI with sorting is reasonable if you would be happy with a child of either sex and simply prefer one, if you want to avoid stimulation, egg collection and anaesthesia, or if IVF is not available or affordable to you. What it is not is a cheaper route to the same outcome.
What to establish before paying
- This clinic's pregnancy rate per IUI cycle, for my age band, from their own data.
- The cost of a cycle including sorting, medication and monitoring — and whether any of it is discounted on repeat cycles.
- The proportion of their sex-selection IUI patients who had a child of the selected sex.
- At how many failed cycles they would advise moving to IVF — and what that conversation costs.
Can you choose the gender with IUI?
Not definitively. IUI can use sperm sorted to favour one sex, which shifts the odds. It does not identify or select anything, so a real chance of the other sex remains.
How accurate is IUI gender selection?
It is only as good as the sorting method used, and those shift the odds rather than deciding them. Published enrichment figures come mainly from the programmes offering the technology.
Is IUI gender selection cheaper than IVF?
Per attempt, yes. Per child of the sex you selected, often not, because most IUI cycles do not result in a pregnancy and a share of those that do produce the other sex.
How much does IUI gender selection cost?
Less per cycle than IVF, but the figure to compare is cost across the number of cycles likely to be needed, including medication and monitoring. Ask whether repeat cycles are discounted.
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