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Semen Analysis Normal Values — WHO 2021 Reference

Check your semen analysis results against WHO 2021 (6th edition) reference limits: concentration ≥16 M/mL, progressive motility ≥30%, morphology ≥4%, volume ≥1.4 mL. Instant result with clinical diagnosis.

🗓️ Updated June 2026 Reviewed by Martín Rodríguez

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Reviewed by: Martín Rodríguez (editorial policy ) · Last reviewed: Jun 20, 2026

Sperm Concentration (million/mL)*

Progressive Motility (%)*

Normal Morphology (%)*

Semen Volume (mL)*

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The WHO 6th Edition (2021) established updated lower reference limits for semen parameters, derived from the 5th percentile of fertile men who conceived naturally within 12 months. Enter the four core values from your semen analysis report and this calculator will flag any parameters below the WHO 2021 thresholds, name the corresponding clinical term (oligozoospermia, asthenozoospermia, teratozoospermia, or hypospermia), and tell you whether a specialist referral is warranted. These values are reference ranges, not diagnoses — always discuss your results with a urologist or fertility specialist.

When to use this calculator

Quickly check whether your semen analysis report falls within WHO 2021 normal ranges before a fertility consultation
Identify which specific parameters (concentration, motility, morphology, volume) are outside reference ranges and learn the clinical terminology
Understand the difference between WHO 2010 and WHO 2021 thresholds when comparing older and newer lab reports
Educational reference for andrology students, nurses, and general practitioners reviewing male fertility basics

Oligozoospermia Severity Classification — WHO 2021

Sperm Concentration (million/mL)	Classification
≥ 16	Normal
10 – 15.9	Mild oligozoospermia
5 – 9.9	Moderate oligozoospermia
1 – 4.9	Severe oligozoospermia
< 1	Cryptozoospermia
0	Azoospermia

Fuente: WHO Laboratory Manual for the Examination and Processing of Human Semen, 6th Edition (2021) — thresholds based on the 5th percentile of fertile men who conceived naturally within 12 months.

How it works

WHO 2021 Semen Analysis Reference Values — Complete Table

The WHO 6th Edition (2021) Laboratory Manual established lower reference limits for semen parameters based on the 5th percentile of fertile men — men who conceived naturally with a time to pregnancy of 12 months or less.

Reference Values: WHO 2021 vs WHO 2010

Parameter	WHO 2021 (6th Ed.)	WHO 2010 (5th Ed.)	Below threshold =
Sperm Concentration	≥ 16 million/mL	≥ 15 million/mL	Oligozoospermia
Progressive Motility	≥ 30%	≥ 32%	Asthenozoospermia
Normal Morphology	≥ 4%	≥ 4%	Teratozoospermia
Semen Volume	≥ 1.4 mL	≥ 1.5 mL	Hypospermia
Total Sperm Count	≥ 39 million/ejaculate	≥ 39 million/ejaculate	Low total count
Total Motility (PR+NP)	≥ 42%	≥ 40%	Global asthenozoospermia

Oligozoospermia Severity Scale

Concentration (M/mL)	Classification
≥ 16	Normal
10 – 15.9	Mild oligozoospermia
5 – 9.9	Moderate oligozoospermia
1 – 4.9	Severe oligozoospermia
< 1	Cryptozoospermia
0	Azoospermia

How the Calculator Works

The calculator compares each of the four entered values against the WHO 2021 lower reference limits:

Concentration < 16 M/mL → Oligozoospermia

Progressive motility < 30% → Asthenozoospermia

Normal morphology < 4% → Teratozoospermia

Volume < 1.4 mL → Hypospermia

If all four parameters meet or exceed their thresholds, the result is Normal. When multiple parameters are flagged, the terms are combined (e.g., Oligoasthenozoospermia, or OAT syndrome when all three sperm parameters are abnormal).

Clinical Interpretation

These are population-based reference limits, not absolute fertility cutoffs. A normal semen analysis does not guarantee fertility, and mildly abnormal values do not necessarily prevent conception. Multiple parameters outside range (e.g., oligoasthenoteratozoospermia, or OAT syndrome) are generally associated with lower natural conception rates and may warrant referral to an andrologist or reproductive endocrinologist.

A single test result can vary due to recent illness, fever, stress, or abstinence duration. Most clinical guidelines recommend repeating the analysis after 2–3 months before drawing conclusions.

Important Disclaimer

This tool is for informational purposes only and does not constitute medical advice. Results should be interpreted in the context of your full clinical history by a qualified healthcare professional.

Example: Borderline semen analysis

Sperm concentration: 12 million/mL (below threshold of 16 M/mL) → Oligozoospermia

Progressive motility: 25% (below threshold of 30%) → Asthenozoospermia

Normal morphology: 5% (above threshold of 4% — normal) ✓

Semen volume: 2.2 mL (above threshold of 1.4 mL — normal) ✓

Two parameters flagged: Oligozoospermia + Asthenozoospermia

Oligozoospermia + Asthenozoospermia — Repeat in 2–3 months. Consult a urologist.

Frequently asked questions

What are the WHO 2021 normal values for a semen analysis?

According to the WHO 6th Edition (2021), the lower reference limits (5th percentile of fertile men) are: sperm concentration ≥16 million/mL, progressive motility ≥30%, normal morphology ≥4%, and semen volume ≥1.4 mL. These are slightly different from the 2010 (5th edition) values and are the most current internationally accepted reference range.

How are the WHO 2021 values different from WHO 2010?

The main changes are: concentration threshold increased slightly from 15 to 16 million/mL; progressive motility threshold decreased from 32% to 30%; and semen volume threshold decreased from 1.5 mL to 1.4 mL. Morphology stayed the same at 4%. The 2021 update also re-introduced the rapid progressive motility sub-category and expanded the reference population to 12 countries.

What does oligozoospermia mean?

Oligozoospermia means sperm concentration is below 16 million/mL (WHO 2021 limit). It ranges from mild (10–15.9 M/mL) to moderate (5–9.9 M/mL) to severe (under 5 M/mL). Low concentration can reduce the probability of natural conception, but does not eliminate it. Causes include hormonal imbalances, varicocele, infections, and lifestyle factors.

What does asthenozoospermia mean?

Asthenozoospermia means that fewer than 30% of sperm show progressive forward movement. Poor motility reduces the ability of sperm to travel through the cervix and fallopian tubes to reach the egg. It can be caused by oxidative stress, infection, varicocele, or anti-sperm antibodies. Treatment depends on the underlying cause.

What does teratozoospermia mean?

Teratozoospermia means fewer than 4% of sperm have a normal shape as assessed by Kruger strict morphology criteria. Abnormal shapes include head, midpiece, and tail defects. Morphology is assessed under high-magnification microscopy in the lab. Most sperm in healthy men are morphologically abnormal — the 4% threshold reflects what is found in fertile men.

What does OAT syndrome mean in a semen analysis?

OAT syndrome (oligoasthenoteratozoospermia) means all three main sperm parameters are below normal: concentration below 16 M/mL, progressive motility below 30%, and morphology below 4%. OAT is the most common finding in infertile men and is often associated with lower natural conception rates. Assisted reproduction (especially ICSI) is frequently recommended.

Why do I need to abstain before a semen analysis?

WHO guidelines recommend 2–7 days of sexual abstinence before semen collection. Shorter abstinence reduces total sperm count and volume; longer abstinence increases the proportion of old or dead sperm, which can worsen motility and morphology. The standard window of 2–7 days ensures the most representative and reproducible sample.

Should I repeat my semen analysis if results are abnormal?

Yes. Most clinical guidelines, including those of the European Association of Urology (EAU) and the American Urological Association (AUA), recommend repeating semen analysis after 2–3 months if an abnormality is found. Sperm production (spermatogenesis) takes about 74 days, so lifestyle or treatment changes take at least that long to show up in results.

What lifestyle factors can improve semen parameters?

Evidence supports avoiding smoking and excessive alcohol, maintaining a healthy weight (obesity is linked to lower testosterone and poorer semen quality), reducing scrotal heat (avoiding laptops on the lap, hot baths, and tight underwear), managing stress, and eating a diet rich in antioxidants (vitamins C and E, zinc, folate). Results from lifestyle changes typically take 3 months or more to appear.

Can a man with completely normal semen analysis still be infertile?

Yes. A normal semen analysis assesses quantity and macroscopic quality, but not sperm DNA fragmentation, zona-binding capacity, or acrosome function. Some men with normal basic parameters have high DNA fragmentation that impairs fertilization and embryo development. Advanced sperm function tests can be ordered by a specialist if routine analysis is normal but conception is still not achieved.

Sources & references

Methodology & trust

Editorial

Calculadora de salud revisada por el equipo editorial de Hacé Cuentas, contrastada con WHO Laboratory Manual for the Examination and Processing of Human Semen, 6th Edition (2021), según nuestra política editorial y metodología.

Updates

Última revisión: June 20, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.

Privacy

Calculations run 100% in your browser. We do not store or transmit your data.

Limitations

Indicative results. For critical decisions, consult a professional.

📌 How to cite this calculator

Rodríguez, M. (2026). Semen Analysis Normal Values — WHO 2021 Reference. Hacé Cuentas. https://hacecuentas.com/spermiogram-reference-values-who-2021

Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.

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