Ovarian Stimulation for IUI Cycles

Primary Recommendation for Ovarian Stimulation

The American Society for Reproductive Medicine recommends that IUI should be combined with ovarian stimulation to improve live birth rates in couples with unexplained infertility and men with a total motile sperm count (TMSC) above 10 million, representing moderate-strength evidence from comprehensive international guidelines 1, 2

Gonadotropins (FSH) yield significantly higher pregnancy rates than clomiphene citrate (OR = 1.8, 95% CI 1.2–2.7), though clomiphene remains an acceptable alternative when cost is a primary concern 3
Clomiphene citrate or tamoxifen are acceptable alternatives to low-dose gonadotropins for lower multiple pregnancy rates and reduced costs, although at a lower live birth rate than with gonadotropins 2, 3

When gonadotropins are used in IUI, regimens with 75 IU or lower should be used because higher doses have similar pregnancy rates but increase multiple pregnancy rates 2, 3, 4

To prevent high rates of multiple gestation pregnancies in IUI with ovarian stimulation, IUI should be withheld when more than two dominant follicles >15 mm or more than five follicles >10 mm at the time of hCG injection or LH surge are present 2, 3, 4, 5
Multiple pregnancy risk is 10-20% with gonadotropin stimulation without proper cycle management 5
The goal is to achieve exactly 2 mature follicles (>15mm) to balance success against multiple pregnancy risk 4
Compared to one dominant follicle, pregnancy rates increase by 5%, 8%, and 8% with two, three, or four dominant follicles, respectively, but multiple pregnancy risk increases to 6%, 14%, and 10% respectively 3

In couples with unexplained infertility and men with a TMSC of >10 million and a prognosis of pregnancy without assistance <30% within a year, at least three cycles of IUI with ovarian stimulation is the most cost-effective option 1, 2, 6
IUI with ovarian stimulation is more cost-effective than proceeding directly to IVF, particularly when strict cancellation criteria minimize multiple pregnancies 6
At least 3 consecutive IUI cycles should be performed before transitioning to IVF/ICSI, as cycle fecundity remains acceptable through cycle 3 4, 5
When IVF with elective single embryo transfer achieves ongoing pregnancy rates exceeding 38%, it becomes preferable to IUI with ovarian stimulation 6

Do not add GnRH agonists to gonadotropins as they increase multiple pregnancy rates and costs without improving pregnancy rates 3, 5
Do not use FSH doses higher than 75 IU/day as a starting dose, as higher doses yield similar pregnancy rates but significantly increase multiple pregnancy risk 2, 3
Do not proceed with insemination when >2 follicles >15mm develop, as this dramatically increases high-order multiple pregnancy risk without proportional benefit 4, 5