IUI Explained: What Actually Happens, Step by Step
Simpler than IVF, but not as simple as most explanations make it sound. IUI gets described as "the simple one" so often that people walk in expecting almost nothing to it. It is simpler than IVF, no egg retrieval, no embryo lab, but there's still a real process behind it, and knowing each step makes the actual appointment far less nerve-wracking.
Step 1: Ovulation Tracking (With or Without Mild Stimulation)
Your cycle is monitored through bloodwork and ultrasound scans to track follicle growth. Some IUI cycles use oral medication like letrozole or clomiphene to encourage one or two follicles to mature; others track a fully natural cycle, depending on your history.
Step 2: The Trigger Shot
Once a follicle reaches the right size, a trigger injection is given to time ovulation precisely, this is what allows the clinic to schedule the insemination for the exact window it needs to happen in, usually 24–36 hours later.
Step 3: Sperm Washing and Preparation
On the day of the procedure, a sperm sample is "washed" in the lab, separating healthy, motile sperm from seminal fluid and slower or non-motile sperm. This concentrated sample is what actually gets used, giving the healthiest sperm a shorter, more direct path to the egg.
Step 4: The Insemination Itself
This is the part people brace for and are usually relieved by: a thin, flexible catheter delivers the prepared sperm sample directly into the uterus. It takes a few minutes, feels similar to a Pap smear for most women, and needs no anaesthesia.
Step 5: The Two-Week Wait
From here, it's biology's turn. A blood test roughly two weeks later confirms whether implantation happened, the same waiting period IVF patients go through, with all the same emotional weight.
Who IUI Actually Works Best For?
IUI is often recommended for couples with mild male factor infertility, where sperm washing can improve the quality of sperm used, unexplained infertility, or ovulation irregularities, especially when combined with fertility medications. It is also commonly used with donor sperm for single women or same-sex couples who wish to build a family. Success rates per cycle generally range from 10–20%, depending on factors such as age and the underlying cause of infertility. Because of these modest success rates, doctors usually recommend trying IUI for a few cycles before considering IVF, rather than continuing it indefinitely.
We walk every IUI patient through their own monitoring results in real time, not just the final go-ahead because understanding why a cycle is timed the way it is tends to make the two-week wait that follows feel a little less like a black box.
Wondering if IUI is the right starting point for you? Book a fertility consultation with our specialists to see whether your history and test results point toward IUI, IVF, or something else first.