IUI or IVF: which treatment is right for us?

In IUI, washed sperm is placed in the womb around ovulation, and the egg is fertilised inside your body, so at least one tube must be open and the sperm reasonably normal. In IVF, eggs are collected and fertilised in a laboratory. IUI can be a first step for unexplained infertility or ovulation problems. IVF is usually advised for blocked tubes, significant sperm problems, older age, or after IUI hasn't worked.

The right choice depends on the cause, your age and how long you have been trying. This page explains what each treatment involves, who it tends to suit, and what international guidelines say about when to move on from IUI. The sources are listed at the end.

What happens in IUI?

IUI stands for intrauterine insemination (permanian beradas in Malay). A typical cycle goes like this:

1. Check the tubes first. IUI only works if sperm can meet the egg in a fallopian tube, so your clinic will confirm that at least one tube is open.
2. With or without fertility medicine. IUI can be done in your natural cycle, or with tablets (such as letrozole or clomiphene) or injections that boost egg production.
3. Scans. Vaginal ultrasound scans track the follicles. If too many grow, the cycle may be cancelled to avoid a twin or triplet pregnancy.
4. Timing. A hormone injection, or ovulation tests, time the insemination for when you ovulate.
5. Insemination. The laboratory washes your husband's semen sample and separates out the active, good-quality sperm. A thin, flexible tube passes through the cervix and the sperm goes into the womb. It takes a few minutes, is not usually painful, and may cause brief cramping.
6. Pregnancy test on the date your clinic gives you. Testing earlier can give a misleading result.

See IUI for more.

What happens in IVF?

IVF (in vitro fertilisation, persenyawaan in vitro or bayi tabung uji) takes over more of the steps:

1. Hormone injections stimulate several eggs to grow, checked with scans and blood tests over several days.
2. Egg collection under sedation, with a fine needle passed through the vagina.
3. Fertilisation in the laboratory, either by mixing eggs and sperm or by injecting one sperm into each egg (ICSI), which is used when the sperm are significantly abnormal or fertilisation failed before.
4. Embryo culture for two to five days.
5. Embryo transfer into the womb, and freezing of any other suitable embryos for later.

IVF does not need open tubes, and it shows what happens at each step: how many eggs grow, whether they fertilise and how the embryos develop. It is also more invasive and more costly than IUI, with more injections, a minor procedure and more visits. See IVF and frozen embryo transfer.

Who might IUI suit?

Unexplained infertility. When all the tests are normal, IUI with fertility medicine is a reasonable first treatment. ESHRE's 2023 guideline recommends IUI with ovarian stimulation as first-line treatment, and says IVF is probably not recommended over it. ASRM's 2020 guideline also starts with IUI and fertility tablets. The UK's NICE guideline (updated March 2026) advises trying naturally for 2 years in total, then considering up to 4 cycles of IUI with stimulation before IVF, or going straight to IVF. NICE advises against fertility medicine on its own for unexplained infertility, and ASRM advises against IUI without fertility medicine (in a natural cycle).

Ovulation problems, such as PCOS. The first step is usually not IUI but ovulation tablets. The 2023 international PCOS guideline recommends letrozole as first-line treatment, with timed sex or IUI, after the tubes and semen have been checked. Injections (gonadotrophins) are second-line, and IVF is offered if these have not worked. See PCOS and fertility.

Mild sperm problems. This is where the evidence is weakest. Washing separates out the active, good-quality sperm, and some of the studies behind the guidelines included couples with mild male factor. But NICE made no separate recommendation, because there is no agreed definition of "mild", and the UK's fertility regulator (HFEA) lists male factor infertility among the situations where IUI is not suitable. LPPKN's IUI subsidy requires the husband's sperm count and movement to be normal. If the semen analysis is clearly abnormal, IVF with ICSI is usually advised. See semen analysis results.

Endometriosis. NICE suggests trying naturally for up to 2 years or having surgery first, then considering up to 4 cycles of stimulated IUI before IVF, or IVF directly. HFEA says IUI is not suitable with severe endometriosis, so IVF is usually advised then. See endometriosis.

Couples who can't have intercourse, for example because of a physical disability or a sexual difficulty. IUI is a simple way to place sperm where it needs to be.

Who usually needs IVF?

• Blocked or badly damaged tubes. If both tubes are blocked, IUI cannot work. If a tube is swollen with fluid (hydrosalpinx), NICE advises removing it or blocking it off before IVF.
• Significant sperm problems, including very low counts, where ICSI is used. Men with no sperm in the semen may need surgical sperm retrieval.
• Older age or low ovarian reserve. HFEA notes that women in their late 30s or over 40 may be advised to have IVF rather than IUI, because time and egg numbers matter more. See fertility after 35 and IVF after 40 and low AMH.
• Several problems at once, such as a borderline sperm test and a woman over 35.
• IUI or ovulation tablets have not worked.

How many IUI cycles before moving on to IVF?

Guidelines agree that IUI should not go on indefinitely, but they differ on the details:

Guideline	For unexplained infertility	When to move on
NICE (UK), 2026	Try naturally for 2 years in total, then consider IUI with gonadotrophin injections, or IVF	After up to 4 IUI cycles
ASRM (US), 2020	IUI with tablets (clomiphene or letrozole)	Typically after 3 or 4 cycles; then IVF rather than IUI with injections
ESHRE (Europe), 2023	IUI with stimulation first	No fixed number; decide on your age, how long you have tried and your earlier treatment

The guidelines also differ on which medicine to use with IUI, and much of the evidence behind them is rated low quality. That is why advice varies between specialists, and why your age and how long you have been trying should shape the plan as much as the diagnosis.

In practice, ask your specialist to review the plan after three or four IUI cycles at most. None of these guidelines sets a different number of cycles by age, but time matters more as you get older.

What are the risks?

• Twins or more. With IUI using fertility medicine, the main risk is a multiple pregnancy, which carries serious risks for mother and babies. That is why scans are needed and cycles with too many follicles are cancelled. ESHRE advises low doses with careful monitoring. In IVF, the number of embryos that can be transferred is limited by Malaysian rules for the same reason (see what Malaysian law allows).
• Ovarian hyperstimulation syndrome (OHSS), a severe reaction to fertility injections, is a risk whenever injections are used, including in IVF. Your clinic watches for it with scans during stimulation.

Paying for IUI and IVF: BuAI covers IUI only

LPPKN's BuAI programme subsidises IUI only, up to two cycles in your lifetime, at most one a year. It does not subsidise IVF. Both spouses must be Malaysian citizens, household income must be under RM10,000 a month, the wife must be under 37 by year of birth, at least one tube must be open and the husband's sperm count and movement must be normal. This is one reason many couples ask about IUI first.

The EPF Akaun Sejahtera withdrawal can be used for IUI, IVF or ICSI, and LHDN's tax relief covers both. See paying for fertility treatment. Whichever you choose, treatment in Malaysia is only for married couples using their own eggs and sperm.

Questions to ask your specialist

• Are my tubes open, and how do you know?
• What did the semen analysis show, and is it good enough for IUI?
• Do you advise tablets or injections with IUI, and why?
• How many IUI cycles do you suggest before we review the plan?
• Given my age and AMH, would we lose useful time by trying IUI first?

Sources

• NICE, Fertility problems: assessment and treatment (NG257), 31 March 2026, replacing CG156. Recommendations 1.34.3, 1.36.1–1.36.2, 1.37.1, 1.38.1–1.38.3, 1.39.3, 1.50.2, and the rationale for 1.38.
• ESHRE, Evidence-based guideline: unexplained infertility, Human Reproduction, 2023.
• American Society for Reproductive Medicine, Evidence-based treatments for couples with unexplained infertility: a guideline, Fertility and Sterility, 2020.
• Teede and others, Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome, Human Reproduction, 2023.
• Human Fertilisation and Embryology Authority, Intrauterine insemination (IUI) and In vitro fertilisation (IVF).
• NHS, Artificial insemination and IVF.
• LPPKN, Program BuAI, updated 9 June 2026.

This page is general information, not medical advice.