What percentage of infertility cases are attributed to male factors?

• A. 15%
• B. 30%
• C. 50%
• D. 5%

Answer: (B)

Male factors contribute a substantial share of infertility cases. In standard infertility statistics, about one third of couples with infertility have a male-factor explanation as the sole identifiable cause, and when male factors coexist with female factors, this share can approach a larger portion in aggregate. A commonly cited single-number estimate is around 30%, which sits within the typical 20–40% range reported across populations. So, this reflects the real-world proportion of infertility attributed to male factors.

Semen analysis abnormalities—such as low sperm count, poor motility, or abnormal morphology—are classic examples of male contributors. However, many infertility cases are multifactorial or remain unexplained, and figures can vary by population and how infertility is defined. The other options are outside the usual range seen in epidemiologic data, making 30% the best fit.