IUI vs IVF: Which Fertility Treatment Should You Try First?

Bottom line up front: IUI (intrauterine insemination) is simpler, less invasive, and less expensive than IVF, but it has significantly lower per-cycle success rates. For some patients, three to four IUI cycles before moving to IVF makes clinical sense. For others — particularly those over 38, with blocked tubes, severe male factor, or endometriosis — skipping straight to IVF is more cost-effective and time-efficient. Understanding when each treatment is appropriate helps you avoid wasting months and money on the wrong approach.

How IUI Works

IUI is a relatively simple procedure. Sperm is collected, washed and concentrated in the lab to select the most motile sperm, and then inserted directly into the uterus through a thin catheter timed to coincide with ovulation. The procedure takes minutes and is typically painless. It can be done in a natural cycle or with mild ovarian stimulation medications (Clomid or Letrozole) to increase the number of eggs released.

How IVF Works

IVF is more complex. The ovaries are stimulated with injectable hormones to produce multiple eggs. Eggs are retrieved in a minor surgical procedure under sedation. Sperm and eggs are combined in the laboratory (or via ICSI), and resulting embryos develop for three to five days before being transferred to the uterus or frozen. IVF requires more time, more monitoring, more medications, and more cost — but it offers substantially higher success rates.

Factor	IUI	IVF
Per-cycle success rate (under 35)	10–20%	40–50%
Per-cycle success rate (35–40)	8–15%	30–40%
Per-cycle success rate (over 40)	2–5%	10–25% (own eggs)
Invasiveness	Minimal — no sedation, done in office	Moderate — egg retrieval under sedation
Medications	None or mild (oral)	Injectable gonadotropins
Cost in Colombia	$500–$1,500 per cycle	$3,500–$8,500 per cycle
Cost in the US	$1,500–$4,000 per cycle	$15,000–$25,000 per cycle
Monitoring visits	2–4 per cycle	5–8 per cycle
Time commitment per cycle	2–3 weeks	4–6 weeks
Can address tubal factor?	No	Yes — bypasses tubes entirely
Can address severe male factor?	No — requires minimum sperm quality	Yes — via ICSI

When IUI Makes Sense

IUI is a reasonable first step when you are under 38 with open fallopian tubes and ovulatory function, your partner's sperm analysis shows mild abnormalities (count above 10 million total motile, reasonable morphology), you have unexplained infertility and have not yet tried medicated cycles, or you are using donor sperm (single women, same-sex couples). Most guidelines recommend three to four IUI cycles before moving to IVF. After three failed IUI cycles, the probability of success with additional IUI attempts drops significantly, and IVF becomes the more efficient path.

When to Skip IUI and Go Straight to IVF

Some diagnoses make IUI unlikely to succeed, and attempting it wastes time — which is the most precious resource in fertility treatment, especially for patients over 35. Skip to IVF when both tubes are blocked or significantly damaged, male factor is severe (total motile count below 5–10 million), you are over 38 and time is a critical factor, you have moderate to severe endometriosis, you have already completed three or more IUI cycles without success, or you need PGT-A for genetic screening.

💡 The Cost-Per-Baby Calculation

In the US, three IUI cycles might cost $6,000–$12,000 with a cumulative success rate of 25–40% for patients under 35. One IVF cycle costs $15,000–$25,000 with a 40–50% success rate. In Colombia, three IUI cycles cost $1,500–$4,500 and one IVF cycle costs $5,000–$8,500. The lower absolute costs in Colombia make trying IUI first more financially rational — you are risking less by giving IUI a chance before escalating.

Not Sure Which Treatment Is Right?

A free consultation with a Colombian fertility specialist can help you determine whether IUI or IVF is the best starting point based on your diagnosis and age.

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