When a couple seeks help for difficulty conceiving, two techniques often come up: intrauterine insemination (IUI) and in vitro fertilisation (IVF). Yet they work differently and are not used for the same situations.
Here, simply, is what sets them apart and how the doctor and the couple choose the most suitable technique.
Intrauterine insemination (IUI): helping sperm go further
IUI is the simplest assisted reproduction technique. On the day of ovulation, the husband’s semen, collected and prepared in the laboratory, is placed directly into the uterus with a fine catheter. The most mobile sperm are thus placed closer to the egg.
Fertilisation then happens naturally, in the fallopian tube, as in a spontaneous pregnancy. IUI is often combined with mild ovulation stimulation monitored by ultrasound.
How IUI works
- gentle ovarian stimulation, with tablets or injections;
- monitoring ultrasounds to follow the growth of the follicles;
- an ovulation trigger at the right time;
- collection and preparation of the semen, then insemination, a quick and usually painless procedure done at the practice.
There is no egg retrieval and no anaesthesia. The patient returns to her activities straight away.
IVF: fertilisation takes place in the laboratory
In in vitro fertilisation, the egg and sperm meet outside the body. After stronger ovarian stimulation, the eggs are collected during a retrieval under anaesthesia. They are placed with the sperm in the laboratory, then the embryos are cultured for a few days before being transferred to the uterus.
When sperm quality is very low, ICSI is performed: one sperm cell is injected directly into each egg.
The main differences
- Where fertilisation happens: in the tube for IUI, in the laboratory for IVF.
- Tubes: IUI requires at least one open tube; IVF does not.
- Stimulation: mild for IUI, stronger for IVF.
- Procedures: a quick insemination for IUI; egg retrieval under anaesthesia then transfer for IVF.
- Information gained: IVF makes it possible to observe fertilisation and embryo development, which informs the couple and the team.
What the two techniques have in common
IUI and IVF start from the same point: a full assessment of the couple, to understand the cause of the difficulty. Both use the husband’s sperm and require close ultrasound monitoring during stimulation.
In both cases the aim is the same: a safe pregnancy, in particular by limiting the risk of multiple pregnancy. That is why stimulation is always closely monitored and can be adjusted, or even cancelled, if the ovaries respond too strongly.
Who is IUI for?
IUI may be offered when the tubes are open and the prepared semen contains enough mobile sperm. It is considered in particular for:
- ovulation disorders, when stimulation alone has not been enough;
- cervical mucus problems;
- mild sperm abnormalities;
- unexplained infertility, when the couple’s tests are normal.
Who is IVF for?
IVF is offered when IUI is not possible or has not worked:
- blocked or damaged tubes, or tubes removed by surgery;
- endometriosis, depending on its extent;
- significant sperm abnormalities (ICSI is then often used);
- reduced ovarian reserve or the woman’s age, which make it important not to lose time;
- several unsuccessful inseminations.
How is the choice made?
No technique is “better” in absolute terms: there is the technique suited to your situation. The choice is based on the couple’s full assessment, age, how long you have been trying and treatments already done. It is decided together, during a dedicated consultation.
To see all the options offered at Boudra Fertility Center, visit our page on assisted reproduction in Fes.
The woman’s age often weighs in the decision. When ovarian reserve declines, it may be better not to repeat inseminations and to move to IVF sooner. Conversely, for a young couple with favourable results, starting with IUI, which is less demanding, is often reasonable.
What if the technique does not work?
An unsuccessful attempt is hard, but it also brings information. After each attempt, the doctor reviews with the couple what happened: response to stimulation, sperm quality and, for IVF, the number of eggs and how the embryos developed.
This helps adjust the protocol, suggest another technique or complete the tests. The path is built step by step, with you.
Book an appointment in Fes
A question, a first appointment? The Boudra Fertility Center team is here to help.
Boudra Fertility Center, 7 Rue Abdelkrim El Khattabi, 30000 Fes, Morocco
Frequently asked questions
Is IUI painful?
Generally not. Insemination is a quick procedure, similar to a smear test, done without anaesthesia.
Can we go straight to IVF?
Yes, when the tests justify it: blocked tubes, very low sperm quality, low ovarian reserve or the woman’s age, for example.
How many inseminations before moving to IVF?
It depends on each situation. The doctor reviews each attempt with you and suggests a change of strategy when appropriate.
Is IUI done with the husband’s sperm?
Yes. At Boudra Fertility Center, insemination is done with the husband’s sperm, prepared in the laboratory on the same day.
This article is for information only and does not replace a consultation. For any question about your situation, talk to your doctor.