Understanding Your Semen Analysis Report: What Every Number Means

A semen analysis report arrives with a grid of numbers, abbreviations, and reference ranges. For most men — and many couples — it is entirely opaque without medical training. "Volume 2.8 ml. Concentration 12 × 10⁶/ml. PR 28%. Morphology 3% (Kruger strict)." What does this mean? Is it bad? Is treatment needed?

This article decodes every parameter on a standard semen analysis report, explains what each measures, provides the current WHO 2021 reference values, and describes how abnormalities in each parameter connect to fertility outcomes and treatment.

How a Semen Analysis Is Performed

For a semen analysis to be reliable, the sample must be collected correctly:

• Abstinence period: 3 to 5 days of sexual abstinence before collection — too short underestimates count; too long reduces motility and increases DNA fragmentation
• Collection method: Masturbation into a sterile container — not through a condom (which contains spermicides) and not immediately after intercourse
• Transport: Ideally produced at the laboratory, or transported at body temperature and analysed within 30 to 60 minutes of production
• Laboratory analysis: Performed by a trained andrologist using standardised WHO methodology

A single abnormal result should always be confirmed by a repeat test — at least 4 to 6 weeks after the first, and using the same abstinence period and collection conditions.

Semen Volume

Normal: ≥ 1.4 ml (WHO 2021)

Semen is primarily composed of secretions from the seminal vesicles (approximately 60 to 65%), prostate gland (approximately 30%), and bulbourethral glands — not primarily from the testes. Volume reflects the functional output of these accessory sex glands.

• Low volume (hypospermia, below 1.4 ml): May indicate incomplete collection, retrograde ejaculation (sperm going backward into the bladder), ejaculatory duct obstruction, absence of the seminal vesicles, or simply a short abstinence period. When very low (below 0.5 to 1 ml) with no sperm or fructose, ejaculatory duct obstruction or CBAVD should be investigated.
• High volume (above 6 ml): Not clinically significant, but may dilute sperm concentration, reducing effective total count.

Sperm Concentration

Normal: ≥ 16 million per ml (WHO 2021)

Concentration measures the number of sperm per millilitre of semen. This is what most people mean when they refer to "sperm count" — though total count (concentration × volume) is actually more relevant.

• Oligospermia: Below 16 million per ml. Graded as mild, moderate, or severe (see our Low Sperm Count article).
• Polyzoospermia: Very high concentration (above 250 million per ml) — uncommon, sometimes associated with poor motility.

Total Sperm Count

Normal: ≥ 39 million per ejaculate (WHO 2021)

Total count = concentration × volume. A man with a concentration of 10 million per ml and a volume of 4 ml has a total count of 40 million — meeting the normal threshold despite being below the per-ml concentration threshold. Total count is the more clinically relevant figure for assessing how many sperm are available for fertilisation.

Motility Parameters

Normal: Progressive motility (PR) ≥ 30%, Total motility (PR + NP) ≥ 42% (WHO 2021)

Motility describes the swimming behaviour of sperm:

• Progressive motility (PR): Sperm swimming forward in a straight line or large circle — the fertility-relevant category
• Non-progressive motility (NP): Moving but not progressing — small circles, oscillating tail without forward movement
• Immotile: Not moving

Total motile sperm count (TMSC) = concentration × volume × (PR + NP) / 100. This is the figure used to determine whether IUI is appropriate (typically needs TMSC above 5 to 10 million after preparation) and informs the decision between conventional IVF and ICSI.

• Asthenospermia: Below WHO thresholds for motility. See our dedicated article.
• Necrozoospermia: Very high proportion of immotile, non-viable sperm — may reflect collection delay, anti-sperm antibodies, or structural flagellar defects.

Sperm Vitality (Viability)

Normal: ≥ 54% live sperm (WHO 2021)

Vitality measures the proportion of living sperm, regardless of motility. Assessed by hypoosmotic swelling test or eosin-nigrosin dye exclusion. Important when a high proportion of sperm are immotile — to distinguish sperm that are immotile but alive (as in primary ciliary dyskinesia) from sperm that are dead (necrozoospermia). Immotile but live sperm can still be used for ICSI.

Morphology (Strict Kruger Criteria)

Normal: ≥ 4% normal forms (WHO 2021, strict Kruger criteria)

The proportion of sperm with a perfectly normal head, midpiece, and tail. As discussed in our dedicated article, this threshold is specifically relevant to conventional IVF fertilisation rates. In ICSI, the embryologist selects normal-appearing sperm from even severely abnormal samples.

• Teratospermia: Below 4% normal forms
• Globozoospermia: All sperm have round heads without acrosomes — a specific genetic defect preventing fertilisation without specialised techniques

Additional Parameters

pH

Normal: 7.2 to 8.0. Very low pH (below 7.0) with low volume and absent fructose suggests ejaculatory duct obstruction or seminal vesicle absence. Very high pH may indicate infection.

Fructose

Fructose in semen is produced by the seminal vesicles — it provides energy for sperm. Absent fructose with low volume and no sperm confirms seminal vesicle absence or ejaculatory duct obstruction.

White Blood Cells (Leukocytes)

Normal: Below 1 million per ml. Leukocytospermia (above 1 million/ml white blood cells in semen) suggests genital tract infection or inflammation — an important treatable cause of poor motility and elevated DNA fragmentation.

MAR Test (Anti-Sperm Antibodies)

A MAR positive result above 50% indicates clinically significant anti-sperm antibody binding, which impairs mucus penetration and may impair IUI outcomes. ICSI is recommended in high-MAR cases.

Frequently Asked Questions

Q1. My semen analysis says "OAT syndrome." What does this mean?

OAT stands for oligoasthenoteratospermia — a combination of low count (oligo), poor motility (astheno), and abnormal morphology (terato). It is the most common pattern of combined male factor infertility and is the indication for IVF with ICSI. The severity of each component guides the urgency and specific approach of treatment.

Q2. Should I repeat my semen analysis if one result is normal?

A single normal result is reassuring but not definitive. Sperm quality varies between samples — influenced by abstinence period, recent illness, stress, and collection conditions. In the context of active fertility treatment, a repeat semen analysis confirming normal parameters before the treatment cycle provides additional confidence. For initial screening, a single normal result in the context of no other fertility concerns is generally sufficient.

Q3. What is "round cells" on a semen analysis and is it concerning?

"Round cells" on a semen analysis refers to cells that are not mature sperm — these include white blood cells (leukocytes) and immature germ cells (spermatids and spermatocytes). The report should differentiate between these. If round cells are predominantly white blood cells above 1 million per ml, this suggests genital tract infection. If predominantly immature germ cells, this may indicate a maturation problem in the testes. Differentiation requires peroxidase staining or immunohistochemistry.