IUI vs IVF: How Doctors Assess Which Option May Be Appropriate
Two distinct fertility pathways suited to different clinical circumstances. Learn how specialists decide between them.
Reviewed by Dr. Dileep Kumar H R, MBBS, DGO, DRM
October 2026 · Evidence-Based Healthcare
Intrauterine Insemination (IUI) and In Vitro Fertilisation (IVF) are two of the most widely discussed fertility treatments, but they differ significantly in physiological mechanism, clinical complexity, and cost.
IUI is a first-line, minimally invasive procedure. Highly motile, washed sperm from the partner or donor are placed directly inside the uterine cavity right at the moment of ovulation. The actual fertilization occurs naturally inside the woman's fallopian tube.
For IUI to succeed, at least one fallopian tube must be fully patent, and the semen sample must meet minimum motile sperm thresholds after washing.
IVF, on the other hand, bypasses the fallopian tubes completely. Fertilization occurs in our embryology laboratory, allowing embryologists to monitor embryo quality, test genetics where indicated, and transfer an embryo directly into the uterus.
IUI is often recommended first for younger couples with unexplained infertility, mild ovulatory disorders, or mild male factors. IVF is indicated for tubal blockages, moderate-to-severe male factor, severe endometriosis, low ovarian reserve, or after unsuccessful IUI cycles.
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Frequently Asked Questions
Clinical evidence indicates that the cumulative success of IUI plateaus after 3 to 4 well-monitored cycles. If conception does not occur within 3 cycles, a thorough re-evaluation and discussion regarding IVF is usually recommended.