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IUI (Intrauterine Insemination): How It Works, Success Rates & IUI vs IVF
IUI (intrauterine insemination) places prepared, concentrated sperm directly into the womb around ovulation, so fertilisation happens inside the body.
Quick Facts
Intrauterine insemination (IUI) is a relatively simple, less invasive and lower-cost fertility treatment compared with IVF. In an IUI, specially prepared, concentrated sperm is placed directly into the womb around the time of ovulation — giving the sperm a head start on the journey to the egg.
IUI is often a first-line option for unexplained infertility, mild male-factor infertility, ovulation problems, cervical issues, and minimal/mild endometriosis — and it's also widely used with donor sperm (for single parents and same-sex couples). Its success per cycle is modest — studies commonly report around 10–20% per cycle, varying with age and cause — so it's normal to do more than one cycle, and sometimes to move on to IVF.
This guide explains who IUI suits, exactly what happens, realistic chances, and how it compares to IVF — so you and your specialist can choose what's right for you.
Track your cycle
IUI is timed to ovulation — the ParentVibes Ovulation Tracker and Treatment Dashboard help you and your clinic coordinate.
Open Ovulation Calculator →Useful tools
Things worth knowing
Fertilisation happens inside you
Prepared sperm is placed in the womb so the egg is fertilised in the body, not a lab.
A quick, low-invasive procedure
The insemination is fast and usually only mildly uncomfortable, similar to a smear test.
Success per cycle is modest
Studies commonly report around 10–20% per cycle, varying with age and cause.
More than one cycle is normal
Many couples try a few IUI cycles before considering IVF.
It's timed to ovulation
Cycle monitoring, and sometimes a trigger injection, pin down the right day.
Often a stepping stone to IVF
If several IUI cycles don't succeed, your specialist may advise moving on to IVF.
Everything You Need to Know (How IUI Works & IUI vs IVF)
IUI places prepared sperm into the uterus near ovulation, sometimes alongside ovulation-stimulating medicines. Here is how it compares to IVF at a glance:
| IUI | IVF | |
|---|---|---|
| What happens | Prepared sperm placed in the womb; fertilisation happens inside the body | Eggs collected and fertilised in a lab; embryo placed in the womb |
| Invasiveness | Low (a quick clinic procedure) | Higher (injections, egg retrieval) |
| Cost | Lower | Higher |
| Success per cycle | Modest (often ~10–20%) | Generally higher, but varies with age |
| Often used for | Unexplained, mild male factor, ovulation/cervical issues, donor sperm | Tubal blockage, significant male factor, failed IUI, complex cases |
Often a stepping stone
Many couples try a few IUI cycles before considering IVF — your specialist will advise based on your age, cause and previous results.
Stay coordinated
The ParentVibes Treatment Dashboard keeps scan dates, medicines and the insemination day in one place.
Open IVF Dashboard →What to Expect (During an IUI Cycle)
IUI is generally well tolerated:
Expected effects
- Around the procedure: mild cramping or light spotting; the insemination itself is quick and usually only mildly uncomfortable (similar to a smear test)
- If using medicines: possible bloating, mood changes, or hot flushes from ovulation-stimulating drugs
- Afterwards: you can usually resume normal activity; a pregnancy test follows about 12–14 days later
Track while you read
Tick the symptoms that apply to you. This is a self-check, not a diagnosis — saved on this device only.
Report urgently
Severe abdominal pain/swelling, heavy bleeding, fever, or signs of OHSS (if on medicines) — contact your clinic the same day. Follow your clinic's specific instructions and report any concerning symptoms promptly.
When IUI Is Recommended
IUI may be advised for:
- Unexplained infertility
- Often the best IUI results.
- Mild male-factor infertility
- Enough good-quality sperm to prepare.
- Ovulation problems
- Often combined with ovulation-inducing medicines.
- Cervical factors
- Bypassing cervical mucus issues.
- Minimal/mild endometriosis
- Where fertility is mildly affected.
- Donor sperm
- Single parents, same-sex couples, or severe male factor.
When IUI is less suitable
Blocked fallopian tubes, significant male-factor infertility, or after several failed IUI cycles — IVF is usually considered instead.
Assessment Before IUI
Before IUI, a specialist confirms it's appropriate.
Checks include
- At least one open fallopian tube (IUI needs a clear path) — checked by HSG/HyCoSy
- A sperm sample good enough to prepare (semen analysis)
- Ovulation assessment and whether stimulating medicines are needed
- General fertility workup for both partners
Store reports in ParentVibes to share with your clinic, and use Ask a Doctor for general guidance.
Ask a Doctor →The IUI Process Step by Step
A typical IUI cycle:
- 1. Cycle monitoring
- Tracking ovulation, sometimes with ovulation-stimulating medicines and scans.
- 2. Trigger (if used)
- A "trigger" injection may time ovulation precisely.
- 3. Sperm preparation
- The sample (partner or donor) is "washed" to concentrate the healthiest, most motile sperm.
- 4. Insemination
- The prepared sperm is placed into the womb via a thin catheter — quick and usually only mildly uncomfortable.
- 5. The wait & test
- A pregnancy test about 12–14 days later.
Support through each step
The ParentVibes Treatment Dashboard plus Ask a Doctor support you through each step.
Open IVF Dashboard →Medicines are specialist-led
Any medicines (ovulation induction, trigger) are prescription-only and monitored by your clinic to manage risks like multiple pregnancy and OHSS — never self-medicate.
Through Your IUI Cycle
Practical and emotional self-care:
Self-care through a cycle
- Follow the medicine and monitoring schedule exactly; set reminders
- Live normally but gently — there's usually no need for bed rest after IUI; light activity is fine
- Healthy habits — balanced diet, folic acid, no smoking, limit alcohol
- Plan for the two-week wait — line up support and gentle distractions
- Know your clinic's contact for any concerns
IUI self-care checklist
- Reminders set for medicines/appointments
- Folic acid + healthy habits
- Emotional support arranged
- Two-week-wait plan
- Clinic contact saved
When to See a Doctor
Contact your clinic/doctor:
- Urgently for severe abdominal pain/swelling, heavy bleeding, fever, or OHSS signs (if on medicines)
- If you're unsure about medicines or miss a dose
- To discuss next steps after a cycle (whatever the result) — including whether to repeat IUI or consider IVF
- For emotional distress during treatment
Seek same-day care for urgent signs
Severe pain, heavy bleeding, fever or OHSS signs need urgent attention. Use Ask a Doctor on ParentVibes for general guidance (not emergencies).
Continue learning
Frequently Asked Questions
What is IUI?
A treatment where prepared, concentrated sperm is placed directly into the womb around ovulation, so fertilisation can happen inside the body.
Who is IUI for?
Often used for unexplained infertility, mild male-factor, ovulation or cervical issues, mild endometriosis, and with donor sperm.
What's the success rate of IUI?
Modest per cycle — studies commonly report around 10–20%, varying with age and cause. More than one cycle is normal.
How is IUI different from IVF?
IUI places sperm in the womb (fertilisation inside the body); IVF fertilises eggs in a lab and transfers an embryo. IUI is simpler and cheaper but generally has lower per-cycle success.
Does IUI hurt?
It's usually quick and only mildly uncomfortable, similar to a cervical smear; mild cramping or spotting can follow.
How many IUI cycles should we try?
This varies — your specialist will advise, often suggesting IVF if several IUI cycles don't succeed.
Can IUI be done without medicines?
Yes (natural-cycle IUI), or with ovulation-stimulating medicines — your clinic will recommend based on your situation.
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Medical review
- Last reviewed
- June 2026
- Medical reviewer
- Dr. Vinika G.
- Next review due
- June 2027
- Status
- Medically reviewed by Dr. Vinika G.
References
This article is for general information and education only and is not a substitute for professional medical advice, diagnosis, or treatment. IUI suitability and success vary by individual. Consult a registered fertility specialist for assessment and care, and before any medicine. Seek urgent care for severe pain, heavy bleeding, fever, or OHSS signs. In a medical emergency, contact your clinic or local emergency services immediately. Content reviewed against guidance from the NHS and peer-reviewed literature.
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Medical disclaimer
This article is for educational purposes only and does not replace medical advice. If you have severe pain, heavy bleeding, missed periods, or unusual symptoms, please consult a qualified healthcare provider.