IUI vs IVF: What's the Difference, and Which Should You Try First?

When a couple first visits a fertility clinic, they often leave with two acronyms they'd never heard before: IUI and IVF. They sound similar. They're both fertility treatments. But they are fundamentally different procedures, with very different costs, invasiveness, and success rates.

The right choice depends on your diagnosis, your age, and how long you've been trying. This guide explains both clearly.

What Is IUI?

Intrauterine Insemination (IUI) is a relatively simple procedure. The man provides a sperm sample, which is washed and concentrated in the lab. The prepared sperm is then placed directly into the uterus through a thin catheter, at the time of ovulation. The procedure itself takes about five minutes and requires no sedation. It feels like a smear test.

IUI may be done in a natural cycle (timed to natural ovulation) or in a stimulated cycle (with mild fertility medications to produce one or two follicles). The goal is to get more sperm closer to the egg, improving the odds of natural fertilisation.

What Is IVF?

In Vitro Fertilisation (IVF) is significantly more involved. The woman is given injectable hormones for 10–14 days to stimulate the ovaries to produce multiple eggs. Those eggs are retrieved under sedation in a short surgical procedure. In the lab, the eggs are fertilised with sperm — either by conventional IVF (eggs and sperm placed together) or ICSI (a single sperm injected into each egg). The resulting embryos are cultured for 3–5 days. One or two embryos are then transferred back into the uterus.

Success Rates: The Honest Comparison

IUI success rates per cycle are 10–20% for women under 35 with a favourable diagnosis. IVF success rates per cycle are 35–40% for the same group. IVF is roughly twice as likely to result in a live birth per attempt.

However, because IUI is so much cheaper (₹15,000–25,000 vs ₹1.5–3.5 lakh), many couples do 3–4 IUI cycles before moving to IVF. The cumulative success rate after 3 IUI cycles can reach 40–50% in good-prognosis patients — comparable to one IVF cycle. The maths can work in IUI's favour if you are a good candidate.

When Should You Start With IUI?

IUI is a reasonable first step if: you are under 35, you have been trying for less than two years, your partner's sperm count and motility are within normal range (or borderline), your fallopian tubes are confirmed open, there is no diagnosis of moderate-to-severe endometriosis, and the cause is unexplained or mild cervical factor.

When Should You Go Straight to IVF?

Go directly to IVF if: both fallopian tubes are blocked or absent, there is a severe male factor (very low count, poor motility, high DNA fragmentation), you are 38 or older (IUI success rates drop significantly with age), you have moderate-to-severe endometriosis, or you have already tried 3–4 IUI cycles without success.

A good fertility doctor will recommend IUI first when it's medically appropriate — not just because it's cheaper. If a doctor jumps to IVF immediately without clear reason, ask why.

The Bottom Line

IUI and IVF are not competing options — they are sequential steps in a clinical pathway. Most patients who need IVF will try IUI first (if medically appropriate) and progress when it hasn't worked. A clear diagnosis is the key to knowing which step to start on.

Ask your clinic: "Given my specific diagnosis and age, what are my realistic success rates with IUI vs IVF?" The answer should drive the decision.