Semen Analysis

Semen analysis is a laboratory test that evaluates a man's sperm and semen. It is the first test used to look for a male cause of infertility. The test counts the sperm and measures how well they swim (motility). It also assesses their shape (morphology) and measures the volume of semen. The World Health Organization sets the reference ranges used to interpret the result.¹ Clinicians order it early when a couple has difficulty conceiving. A male factor is the only cause in about 20% of couples. It contributes in another 30% to 40%.

A normal result does not rule out a male cause. The test counts sperm and assesses their movement. It does not assess the DNA inside the sperm. Sperm DNA damage can be high even when count, movement, and shape all appear normal. Studies that follow couples over time, and reviews of those studies, link high DNA damage to lower fertilization rates, poorer early embryo development, and more pregnancy loss.²³ That evidence comes from observation of real couples rather than from trials that randomly assign men to groups. It remains the best available evidence on sperm DNA damage. When a couple has no diagnosis, or has lost more than one pregnancy, a normal semen analysis is a reason to keep investigating.

Oxidative stress is another male problem that a standard semen analysis cannot detect. Harmful molecules, reactive oxygen species, accumulate and damage sperm. Lifestyle, infection, a varicocele, and environmental chemicals all increase them.⁴⁵ Sperm can function poorly while the basic numbers still appear normal. Clinicians who evaluate both partners thoroughly do not stop at a normal semen analysis while a couple still cannot conceive.

The restorative approach treats the man as a patient in his own right, not as a sample source. The goal is to identify the cause and correct it: a varicocele, a hormonal problem, an infection, or oxidative damage. Correcting the cause improves sperm quality at its source. Semen analysis is where that work begins, not where it ends. A man with a normal result and no diagnosis deserves the same careful search that restorative care gives to female-factor conditions.