What is IUI? How intrauterine insemination works
IUI, or intrauterine insemination, places prepared, concentrated sperm directly inside the womb around the time of ovulation, giving the sperm a shorter path to the egg. Dr Mayur Pai explains what IUI is, when it is a reasonable option, what happens on the day, and how it differs from IVF.
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What IUI actually is
IUI stands for intrauterine insemination. On the day of the treatment, a semen sample is prepared in the laboratory so that the healthiest, most active sperm are gathered together into a small, concentrated volume. Those prepared sperm are then placed gently, through a thin soft tube, directly inside the womb at the time you are about to release an egg. The idea is simple — we give the sperm a head start, placing them past the cervix and closer to the egg, so more of them reach the right place at the right moment.
When IUI is a reasonable option
IUI is not for everyone, but for the right couple it is a sensible, gentle first step. We often consider it when the man's semen analysis is only mildly reduced — the count and movement are a little below par but not severely so. It can help when there is mild male factor, when tests are largely normal and the difficulty is unexplained, and when the woman has trouble releasing an egg regularly, as often happens in PCOS. For many younger couples with open, healthy tubes, IUI is a reasonable thing to try before moving to anything more involved.
What happens on the day
People are often surprised by how quick and ordinary the procedure is. It is done in the clinic, you are awake throughout, and no anaesthesia is needed. Once the prepared sperm are ready, placing them takes only a few minutes, much like a routine internal examination. Most women rest for a short while afterwards and then simply carry on with the rest of their day. There is no admission and no operating theatre involved for the insemination itself. Knowing this in advance takes away a lot of the worry couples arrive with.
Timing it with scans
The single most important part of IUI is timing, because the sperm need to be in place just as the egg is released. To get this right, we track the growing egg with a few quick ultrasound scans over the days leading up to ovulation. Sometimes we support the cycle with gentle medication to help the ovary grow a good egg, and we watch it on the scan until it is ready. When the timing is right, the insemination is done. This careful tracking is what turns IUI from guesswork into a properly timed treatment, and it is why the scans matter as much as the procedure itself.
How IUI differs from IVF
It helps to understand where IUI sits compared with IVF. In IUI, fertilisation still happens inside the body, in the natural way — we simply place the sperm closer to the egg and time it well. There is no egg collection, and no embryo is made outside the body. IVF is a bigger step: eggs are collected from the ovary and joined with sperm in the IVF laboratory, and an embryo is grown before being placed in the womb. IUI is the simpler, lighter option; IVF does more of the work for the body and is chosen when IUI is unlikely to be enough. You can read about the cost of IVF openly, and we will always explain honestly which step suits your situation.
Is IUI right for you?
Being honest matters more here than being reassuring. IUI genuinely suits some couples and not others, and the difference lies in your own tests. It works well when the tubes are open, the sperm are only mildly affected, and the woman is younger. It is much less likely to help when the sperm are very few or very weak, when both tubes are blocked, or when age has already reduced the number of eggs a great deal. In those situations, pushing on with repeated IUI can simply lose valuable time, and IVF or ICSI is the kinder, more sensible route. This is exactly why we look at both partners together before advising a path, rather than starting treatment blindly.
Where treatment happens
This guide is by Dr Mayur Pai, MBBS, MS (Obstetrics & Gynaecology), a fertility and laparoscopy specialist. Pai Hospital in Goa has its own operating theatre and its own IVF laboratory, so your scans, the sperm preparation and the procedure all happen in one place, under one team. A consultation looks at the whole picture, as a couple, before we discuss what is realistic for you.
Getting started
Send us a short message on WhatsApp with your situation and any reports you already have, such as a recent semen analysis or scan. Your first online consultation is free, and we are glad to talk things through before you decide anything. This article is for education only and is not personal medical advice; please consult your doctor about your own situation.
What is IUI in simple terms?
IUI, or intrauterine insemination, is a treatment where prepared, concentrated sperm are placed directly inside the womb around the time an egg is released. It gives the sperm a shorter path to the egg, while fertilisation still happens naturally inside the body.
Does IUI need anaesthesia, and is it a big procedure?
No. IUI is a quick treatment done in the clinic while you are awake, without anaesthesia and without admission. Placing the prepared sperm takes only a few minutes, much like a routine internal examination, and most women carry on with their day afterwards.
How is IUI different from IVF?
In IUI, the sperm are simply placed inside the womb and fertilisation happens naturally inside the body, with no egg collection and no laboratory embryo. IVF is a bigger step, where eggs are collected and joined with sperm in the laboratory before an embryo is placed in the womb.
Is IUI suitable for everyone?
No. IUI suits some couples and not others, depending on their own tests. It works well when the tubes are open, the sperm are only mildly affected and the woman is younger. When the sperm are very few, the tubes are blocked, or age has reduced the eggs a great deal, IVF or ICSI is usually the more sensible route.
Do you help with travel to the clinic?
Yes. Free patient transport is available from across Goa and nearby areas, so reaching us for your scans and treatment is not a barrier. Ask us when you message, and we will arrange it.
This page is for general education and is not personal medical advice. Treatment depends on your own examination and reports, so please speak to a doctor about your situation. We do not carry out or offer sex determination of any kind.