Semen Analysis Report Explained
A semen analysis measures several parts of the ejaculate, including semen volume, sperm concentration, total sperm number, motility and morphology. No single value can confirm whether a man is fertile or infertile. A report is interpreted as a pattern, together with how the sample was collected, the abstinence period, recent fever or illness, medicines and the couple’s fertility history. An abnormal result often needs a properly timed repeat test before major decisions are made. Azoospermia, however, requires prompt specialist evaluation and confirmation with examination of the centrifuged semen pellet.
What does a semen analysis measure?
A semen analysis is the basic laboratory test of male reproductive function. It measures the fluid portion of semen and the sperm cells within it. The laboratory method matters: a high-quality report should follow a recognised WHO method and record collection details because incomplete collection, delay in reaching the laboratory or an unusual abstinence interval can change the result.
| Parameter | WHO 2021 lower reference value / practical meaning |
|---|---|
| Semen volume | About 1.4 mL; low volume can result from incomplete collection, short abstinence, retrograde ejaculation or obstruction in selected men |
| Sperm concentration | About 16 million/mL; the number of sperm in each millilitre |
| Total sperm number | About 39 million per ejaculate; concentration multiplied by the ejaculate volume |
| Total motility | About 42%; progressive plus non-progressive moving sperm |
| Progressive motility | About 30%; sperm moving forward rather than only twitching or moving in circles |
| Vitality | About 54% live sperm; particularly useful when motility is very low |
| Morphology | About 4% normal forms using strict assessment |
| pH | Usually above 7.2; interpretation is especially useful in low-volume azoospermia |
| Peroxidase-positive leukocytes | Usually below 1 million/mL; higher levels need clinical context |
These figures are not a pass/fail fertility score. They are lower reference limits derived from fertile men. Pregnancy can occur below a reference value, and some couples struggle despite values above it.
How to read sperm count
Sperm concentration and total sperm number are related but not identical. A concentration of 20 million/mL in a 1 mL sample gives a total of 20 million sperm, while the same concentration in a 3 mL sample gives a total of 60 million. This is why looking only at the concentration can be misleading.
Very low concentrations deserve more investigation than a mildly low result. Severe oligozoospermia can be associated with genetic or testicular causes, while an isolated borderline result may change substantially on repeat testing.
How to read motility
Motility describes movement. Progressive motility is usually more clinically useful than simply asking whether a sperm is moving. Low motility may occur with varicocele, recent fever, prolonged abstinence, oxidative stress, infection/inflammation, sample delay or primary sperm dysfunction. A poorly handled sample can make motility appear worse than it truly is.
How to read morphology
Morphology describes the proportion of sperm that meet strict shape criteria. The reference value is low because the assessment is deliberately strict. A morphology result of 2% does not mean that 98% of sperm are genetically abnormal or that natural conception is impossible. Morphology is also one of the more observer-dependent semen parameters, so it should be interpreted with count and motility rather than in isolation.
Other terms on the report
| Report term | What it means |
|---|---|
| Oligozoospermia / oligospermia | Low sperm concentration |
| Asthenozoospermia / asthenospermia | Low sperm motility |
| Teratozoospermia / teratospermia | Low percentage of normally shaped sperm |
| OAT | Low count + low motility + poor morphology together |
| Azoospermia | No sperm seen in the ejaculate after appropriate pellet examination |
| Cryptozoospermia | Rare sperm found only after centrifugation and careful pellet search |
| Leukocytospermia | Increased white blood cells; suggests inflammation but not necessarily bacterial infection |
| Agglutination | Sperm sticking to each other; different from nonspecific aggregation with mucus or debris |
Why can two semen reports be different?
Semen values naturally fluctuate. The result may also change because of abstinence duration, incomplete collection, fever, medications, stress, laboratory technique or transport time. The WHO 2025 infertility guideline suggests that when one or more semen parameters are outside the WHO reference ranges, a repeat semen analysis should generally be obtained after a minimum of about 11 weeks. This allows a full spermatogenic cycle to pass and reduces the risk of treating a temporary abnormality as a fixed problem.
When does an abnormal report need further tests?
- Azoospermia or cryptozoospermia.
- Severe oligozoospermia, especially when persistent.
- Low count with small testes, high FSH or other signs of testicular dysfunction.
- Low-volume azoospermia or absent vas deferens on examination.
- Persistent abnormalities with a clinical varicocele.
- Repeated abnormal reports despite correct collection and adequate time after fever or illness.
- Infertility with recurrent pregnancy loss or repeated assisted-reproduction failure, where selected advanced tests may be discussed.
What should you do after receiving the report?
First confirm that collection was complete and correctly timed. Then look at the entire pattern rather than one highlighted number. If the report is abnormal, the next step may be a repeat semen analysis, physical examination, hormone tests or genetic evaluation depending on severity. If the report shows azoospermia, do not wait months without evaluation; confirmation and classification should start promptly.
Emergency warning signs
An abnormal semen report is not an emergency. Seek urgent care for sudden severe testicular pain, acute swelling, high fever with scrotal redness or major testicular injury; those symptoms need a separate examination and should not be attributed to the semen numbers.
What to bring for consultation
Bring these if available:
- The semen report with date and laboratory name.
- Previous semen reports for comparison.
- Abstinence period before each sample and whether the whole sample was collected.
- History of fever in the previous 3 months.
- Current medicines, supplements, testosterone or anabolic steroids.
- Any hormone tests, scrotal ultrasound or fertility treatment records.
- Partner’s basic fertility information if available.
FAQs
What is a normal sperm count?
WHO 2021 gives a lower reference value around 16 million sperm/mL and about 39 million total sperm per ejaculate. These are reference limits, not a guarantee of fertility.
Is 4% sperm morphology very low?
Four percent normal forms is around the WHO lower reference value when strict morphology criteria are used. The result must be interpreted with count, motility and the couple’s fertility history.
What is more important: count or motility?
Neither should be judged alone. Total motile sperm count, the number of progressively useful sperm in the whole ejaculate, often gives more practical information than one isolated parameter.
Should I repeat a mildly abnormal semen analysis?
Often yes. The WHO 2025 infertility guideline suggests repeating an abnormal analysis after at least about 11 weeks, unless clinical circumstances justify earlier testing.
Can a normal semen analysis rule out male infertility?
Not completely. Standard semen parameters can be normal in some couples with unexplained infertility, recurrent pregnancy loss or failed ART, but additional testing should be selective rather than routine.
Does pus in semen mean infection?
Not always. White blood cells can reflect inflammation, and a peroxidase test may be used to confirm leukocytospermia. Treatment depends on symptoms, examination and evidence of infection rather than the word “pus cells” alone.
Related reading
- Repeat Semen Analysis: Why It Is Needed
- Abstinence Before Semen Test
- Low Sperm Count: Causes and Treatment
- Low Sperm Motility: Causes and Treatment
- Poor Sperm Morphology: What It Means
- Urologist in Latur
References
- World Health Organization. WHO laboratory manual for the examination and processing of human semen, 6th ed https://www.who.int/publications/i/item/9789240030787
- World Health Organization. Guideline for the prevention, diagnosis and treatment of infertility. 2025 https://www.who.int/publications/i/item/9789240115774
- European Association of Urology. EAU Guidelines on Sexual and Reproductive Health: Male Infertility. 2026 https://uroweb.org/guidelines/sexual-and-reproductive-health/chapter/male-infertility
- American Urological Association/American Society for Reproductive Medicine. Diagnosis and Treatment of Infertility in Men: AUA/ASRM Guideline (2020; Amended 2024) https://www.auanet.org/documents/Guidelines/PDF/2024%20Guidelines/Male%20Infertility%20Unabridged%20Final.pdf