IUI vs IVF: Which Fertility Treatment Is Considered When?
Quick answer: IUI places washed, concentrated sperm directly into the uterus around ovulation, often with mild ovulation medicines, and fertilisation happens naturally inside the body. IVF stimulates the ovaries to produce several eggs, which are collected and fertilised in a laboratory before an embryo is transferred to the uterus. IUI is simpler and less intensive, while IVF is more effective per cycle and suits more complex fertility problems.
IUI (intrauterine insemination) and IVF (in vitro fertilisation) are two of the most common fertility treatments. They differ in how they work, how intensive they are and who they suit. Understanding the differences helps couples discuss the right path with their specialist.
This article is part of our IUI treatment guide.
How does IUI work?
- Ovulation is monitored, often with mild medicines to stimulate one or two follicles.
- An injection may be used to trigger ovulation.
- The partner's or donor's sperm is washed and concentrated.
- Sperm is placed into the uterus through a thin catheter.
- A pregnancy test follows about two weeks later.
How does IVF work?
- The ovaries are stimulated with injections to grow several follicles.
- Eggs are collected in a short procedure under sedation.
- Eggs are fertilised with sperm in the lab, sometimes using ICSI.
- Embryos develop in the lab for several days.
- An embryo is transferred to the uterus, and extra embryos may be frozen.
- A pregnancy test follows.
How do they compare?
| Feature | IUI | IVF |
|---|---|---|
| Where fertilisation happens | Inside the body | In the laboratory |
| Medicines | Mild or none | More intensive stimulation |
| Procedures | Simple insemination | Egg collection and embryo transfer |
| Tubes need to be open | Yes | No |
| Success per cycle | Lower | Higher |
| Cost and time | Lower | Higher |
Who may be suited to IUI?
- Mild male factor infertility
- Unexplained infertility in younger women
- Ovulation problems such as PCOS, with ovulation induction
- Cervical factor or difficulties with intercourse
- Use of donor sperm
At least one fallopian tube must be open.
Who may be suited to IVF?
- Blocked or damaged fallopian tubes
- Moderate to severe male factor infertility
- Endometriosis affecting fertility
- Low ovarian reserve or older age
- Unexplained infertility after unsuccessful IUI
- Need for embryo genetic testing
- Fertility preservation
When do doctors move from IUI to IVF?
Many couples try a limited number of IUI cycles first if suitable. Moving to IVF is often considered if IUI cycles are unsuccessful, if the woman is older, if new findings appear or if the couple prefers a more effective option.
Key Takeaways
- IUI is simpler, IVF is more intensive.
- IUI needs at least one open tube.
- IVF has higher success per cycle.
- Age and diagnosis guide the choice.
- Many couples move to IVF after unsuccessful IUI.
Final Thoughts
There is no one-size-fits-all fertility treatment. A specialist can match the approach to your diagnosis, age and preferences. Dr. Swati Shree at Eve Women and Fertility Clinic in Bengaluru offers both IUI and IVF with personalised planning.
FAQs
What is the main difference between IUI and IVF?
In IUI, sperm is placed in the uterus and fertilisation happens inside the body. In IVF, eggs are collected and fertilised in a laboratory, and an embryo is transferred to the uterus. The difference also drives everything else: cost, intensity, medicines and who each treatment suits. Your diagnosis and how long you have been trying decide which starting point makes sense for you.
Is IUI or IVF more successful?
IVF generally has higher success rates per cycle than IUI. However, IUI may be appropriate for some couples because it is simpler and less intensive. Per cycle IVF gives higher rates, which is why older women or those with tubal or severe sperm issues are advised it earlier. For suitable couples, a few IUI cycles first is a reasonable plan.
Can I have IUI if my tubes are blocked?
No. IUI requires at least one open fallopian tube. IVF bypasses the tubes and is usually recommended for blocked tubes. No, at least one tube must be open for the egg and sperm to meet. With both tubes blocked, IVF is the effective route; with one open and healthy tube, IUI may still be tried.
Should I try IUI before IVF?
For some couples, such as those with mild male factor or unexplained infertility and younger age, a few IUI cycles may be tried first. Others may be advised to go directly to IVF. If you are younger with mild male factor, ovulation problems or unexplained infertility, a few IUI cycles first is reasonable. Severe tubal or sperm disease points straight to IVF instead.
Is IUI painful?
IUI is usually quick and causes only mild discomfort, similar to a Pap smear. Some women have mild cramping afterward.