It isn't a one-size-fits-all choice, and it isn't about which treatment is stronger. Before recommending IUI or IVF, your doctor is reading six things — your age, ovarian reserve, uterus, fallopian tubes, semen parameters, and what you have already tried — and choosing the route those findings point to.
The six things being assessed
Each factor can point either way on its own. The recommendation comes from reading them together.
| What's assessed | What's being looked for | Why it moves the decision |
|---|---|---|
| Your age | Where you are on the fertility timeline | Timing matters as age increases — it changes how many lower-probability cycles are worth spending before escalating |
| Ovarian reserve | Egg quantity, via AMH and an antral follicle count | A reasonable reserve keeps the gentler route open; a low one shortens the runway |
| Your uterus | The cavity and lining — where an embryo would implant | Findings here can need attention before either treatment is worth starting |
| Your fallopian tubes | Whether at least one is open and healthy | IUI depends on a patent tube; IVF bypasses the tubes altogether |
| Semen parameters | Count, motility and morphology | Mild issues can still suit IUI; significant male factor points to IVF, often with ICSI |
| What you've already tried | Previous cycles and their outcomes | A route already given a fair trial is information, not a failure — it changes what comes next |
Where the findings point to IUI
With open fallopian tubes, reasonable semen parameters and a normal ovarian reserve, IUI may be a reasonable option for you — the fundamentals it depends on are intact, and it is the simpler, gentler and less expensive route. Who IUI genuinely helps covers that suitability list in full, and the cycle itself is a single menstrual cycle of monitoring and timing.
Where they point to IVF
When a finding removes the thing IUI relies on, IVF is the honest next step rather than an aggressive one. Blocked tubes, significant male-factor infertility, or a markedly reduced reserve all fall into this group, because IVF works around those specific obstacles instead of hoping past them. Time already spent on IUI cycles counts here too — how many cycles are reasonable is its own conversation, and it depends heavily on age.
Why timing keeps changing the answer
The same set of findings can justify IUI at one age and IVF a few years later, because what changes is not the diagnosis but how much time there is to spend on a lower-probability route. This is why the honest conversation is about sequencing, not ranking: the question is which treatment fits your findings now, and how long to give it before reassessing.
Fertility treatment should be personalised — never copied from someone else's plan.
The question worth asking your doctor
Ask which of the two they are considering for you, and why — which finding is driving it. A clear answer tells you the recommendation came from your reports rather than a default protocol, and it gives you something concrete to revisit if the first route doesn't work.
Frequently asked
Is IVF simply a stronger version of IUI?
No. They solve different problems. IUI shortens the sperm's journey inside your body and still relies on natural fertilisation in an open tube; IVF moves fertilisation to the lab and bypasses the tubes entirely. "Stronger" is the wrong axis — suitability is the right one.
Can we start with IUI and move to IVF later?
Yes, and that is a common, reasonable path when the findings support IUI. The escalation isn't a setback; it's the plan working as intended. What matters is agreeing in advance roughly how many cycles you'll give it before reassessing, so the decision to move on isn't made under pressure.
Do normal reports mean IUI will work?
No — normal findings make IUI appropriate, not certain. They tell you the treatment matches your situation; the outcome still depends on egg and sperm quality, timing and factors no test fully predicts.
If my AMH is low, is IUI ruled out?
Not automatically. A low AMH result describes egg quantity, not your ability to conceive, and the decision still weighs your age, ovulation, tubes and sperm alongside it. What a low reserve usually changes is urgency — how long it makes sense to spend on the gentler route before escalating.
Does either option get decided in a single visit?
Often not. The six factors above need reports — scans, hormone tests, a semen analysis — so the recommendation typically follows the results rather than the first consultation. If a treatment is proposed before those findings exist, ask what it is based on.