When a couple struggles to conceive, the woman is usually the first — and sometimes only — one tested. That's a mistake. Male factors contribute to roughly half of all infertility cases, yet they're often overlooked entirely.

The key diagnostic tool is a semen analysis, which looks at sperm concentration, motility, morphology, and vitality, among other markers. According to the WHO's 6th Edition Semen Manual, healthy reference values include a sperm concentration of at least 16 million per mL, total motility of at least 42%, and normal morphology of at least 4%. These are reference points, not strict pass/fail thresholds — falling below one doesn't automatically mean infertility, but it does warrant a closer look.

Two conditions come up often in these evaluations. Oligozoospermia refers to a sperm concentration below the WHO reference limit — simply put, a lower-than-expected count. Azoospermia is more significant: no sperm detected in the ejaculate at all after proper lab testing. Both can stem from a range of underlying causes, from hormonal issues to blockages to lifestyle factors, which is why further medical evaluation matters rather than assuming the worst from a single result.

The bigger picture is this: infertility is a couple's issue, not a one-sided one. If pregnancy hasn't occurred after 12 months of regular, unprotected intercourse, both partners should be evaluated together. Blaming the woman by default not only delays diagnosis — it can mean missing a treatable male-factor cause entirely.

Educational content only, based on WHO's Laboratory Manual for the Examination and Processing of Human Semen (6th Edition, 2021) and WHO's 2025 infertility guideline. Individual results should always be interpreted by a qualified healthcare professional.