Semen Analysis Interpreter

The World Health Organization publishes reference values for semen analysis — the 2021 sixth edition is the current one. Each value (the 'lower reference limit') is the 5th percentile from a large group of men who fathered a pregnancy within a year of trying. In other words, 95% of recently fertile men had results at or above these numbers. A result below a limit means it's in the lowest 5% of that fertile group — worth looking into — but it is not a diagnosis of infertility, and it doesn't mean conception is impossible. Many men with a value below a limit still conceive.

No. A single value below the reference limit doesn't mean you're infertile. The reference limits are statistical cut-offs from fertile men, not a pass/fail line, and fertility depends on the whole picture (and on both partners). Just as important, semen quality varies a lot from sample to sample — illness, fever, stress, and the abstinence period before the test all affect it — so one analysis is never the final word. If a result is below a limit, the usual next step is simply to repeat the test after a couple of months and talk it through with a clinician.

Follow the lab's instructions, but generally you'll be asked to abstain from ejaculation for 2 to 7 days before the test — not less and not much more, because both extremes can skew the result. Collect the whole sample, keep it at body temperature, and get it to the lab quickly (usually within an hour) if collected at home. Being unwell, having had a recent fever, alcohol, and some medications can all affect the result, so it's worth mentioning those. Because of this natural variation, an abnormal result is typically confirmed with a repeat test.

Volume is how much fluid there is. Concentration is how many sperm per millilitre, and total sperm number is that multiplied by the volume. Motility is the share of sperm that are moving — total motility counts any movement, while progressive motility counts those swimming forward effectively. Morphology (normal forms) is the share that are normally shaped. Vitality is the share that are alive. Each looks at a different aspect of the sample, which is why a report gives several numbers rather than a single score — and why one low value among otherwise normal ones is often less concerning.

If a repeat analysis is still below the reference limits, a clinician — often a urologist or a fertility specialist — can look for a cause, which might include a physical exam, hormone blood tests, and a review of medications, lifestyle, and medical history. Many causes are treatable or manageable, and there are also fertility treatments that can help even when sperm numbers or movement are low. An abnormal result is a starting point for that conversation, not an endpoint. Remember that fertility is a two-person picture, so evaluating both partners is standard.

Yes. This tool runs entirely in your browser. The numbers you enter are compared on your own device and are never sent to a server, saved, or shared — close the tab and they're gone. It's general educational information based on the WHO 2021 reference values; it isn't medical advice or a diagnosis and can't replace the clinician who ordered your test.