Seminal Fluid Analysis
A seminal fluid analysis is the first and most informative test in any male fertility assessment, and it is also the test most often misread by the person it belongs to. A single figure in the wrong column can make a man believe he is infertile when he is not. This page explains what the test measures, what the WHO reference limits genuinely represent, and how to read your own report without frightening yourself unnecessarily.
What a seminal fluid analysis measures
The laboratory examines a fresh semen sample and records volume, pH, sperm concentration, total sperm number, how many sperm are moving and how well, how many are alive, and how many have a normal shape. It also looks for white cells, clumping and debris.
Modern laboratories follow the methods set out in the WHO manual, which standardises how each of these is counted. That standardisation is the reason a seminal fluid analysis from one accredited laboratory can be compared with another.
What the test does not do is measure the genetic quality of sperm, or tell you whether fertilisation will occur. It describes the sample in front of the microscope on that day, which is useful but narrower than most patients assume.
How to prepare and produce the sample
- Abstain from ejaculation for two to seven days — not longer, as very long abstinence reduces motility.
- Collect the entire ejaculate. The first portion carries most of the sperm, and losing it is the commonest reason for a falsely low count.
- Use no lubricant, saliva or ordinary condom; these are toxic to sperm.
- If produced at home, deliver it within an hour, kept close to body temperature, never refrigerated.
- Mention any fever, illness, antibiotic course or unusual heat exposure in the past three months.
The WHO lower reference limits
These are the lower reference limits published in the sixth edition of the WHO laboratory manual for the examination and processing of human semen, with the widely used fifth edition values alongside for comparison.
| Parameter | WHO 2021 (6th ed.) | WHO 2010 (5th ed.) |
|---|---|---|
| Semen volume | 1.4 ml | 1.5 ml |
| Sperm concentration | 16 million/ml | 15 million/ml |
| Total sperm number | 39 million per ejaculate | 39 million per ejaculate |
| Progressive motility | 30% | 32% |
| Normal morphology | 4% | 4% |
| Vitality (live sperm) | 54% | 58% |
| pH | 7.2 or above | 7.2 or above |
Check which edition your laboratory quoted. A report can look worse or better than an earlier one purely because the reference set changed between editions.
Why these are reference values, not a pass mark
This is the single most important paragraph on the page. Each limit is the fifth centile of a large group of men whose partners conceived naturally within twelve months of trying.
In other words, they are drawn from men of proven fertility — and by definition, five in every hundred of those fertile men fell below each limit. A value under the line therefore means your result sits in the lower part of a fertile population’s range. It is not a diagnosis of infertility, and it is not a threshold you have failed.
The reverse is also true. Every value inside the range does not guarantee conception, which is why a normal seminal fluid analysis never ends the investigation of a couple on its own.
What each parameter tells you
Volume. A very low volume can point to a collection problem, a blockage at the far end of the duct system, or semen passing backwards into the bladder.
Concentration and total number. Counts below the reference limit are described as oligospermia, which is graded and investigated in its own right.
Motility. Progressive motility — sperm moving purposefully forward — matters more than the raw proportion moving. Poor motility with a normal count suggests a different set of causes.
Morphology. Only a small minority of sperm are normally shaped even in fertile men, which is why the reference limit is 4% and not something higher. A low morphology figure alone is rarely the whole story.
White cells. Raised numbers may indicate infection or inflammation and are followed up rather than ignored.
Why one report is not a diagnosis
Semen parameters vary considerably in the same man from one sample to the next. A fever six weeks ago, a heavy course of antibiotics, a hot working environment or a difficult collection can all shift a result.
Because sperm production takes around seventy-four days, today’s report partly reflects the last two to three months. An abnormal result is therefore repeated after an interval, usually between a few weeks and three months, before any conclusion is drawn.
Reasons a report can read worse than it should
Before accepting an abnormal seminal fluid analysis at face value, rule out the avoidable explanations:
- Part of the sample lost during collection, particularly the sperm-rich first portion.
- Abstinence much shorter or much longer than the recommended two to seven days.
- Delay or cooling in transit from home to the laboratory.
- Lubricant, saliva or an ordinary condom used during collection.
- Fever, infection or a heavy antibiotic course in the preceding three months.
- A laboratory not following WHO methodology, or not stating which edition it reported against.
Any one of these is reason enough to repeat the test before acting on it.
If the report says no sperm were seen
This finding needs confirmation before it is accepted. The laboratory should spin the sample and examine the pellet, because a handful of sperm in a centrifuged specimen changes the diagnosis and the treatment completely.
If confirmed on two samples, the next question is whether production has failed or the route out is blocked — non-obstructive azoospermia or obstructive azoospermia. Examination, FSH and testicular volume usually separate the two.
A post-ejaculation urine screen belongs here too, especially with a low volume, since sperm travelling backwards into the bladder can mimic azoospermia exactly.
Tests that go beyond the basic analysis
A standard seminal fluid analysis does not assess the genetic integrity of sperm. Sperm DNA fragmentation testing and sperm aneuploidy testing look at different questions again.
At Jananam these are offered selectively, where the answer would genuinely change what is done next, rather than bundled into every work-up. The same principle led to the ERA endometrial receptivity test, used here in more than 750 patients, being withdrawn once the evidence no longer supported it.
The AUA/ASRM guideline on infertility in men sets out which additional tests are supported and which are not.
What happens after the result
A reassuring report shifts attention to the couple as a whole. An abnormal one leads to examination, hormone testing and, where counts are very low, genetic testing.
Both partners are evaluated before a treatment plan is made. A semen report on its own cannot tell you whether to try naturally for longer, to consider insemination, or to move to IVF, because that decision depends on her assessment as well.
An abnormal result also does not automatically mean treatment. Where the abnormality is mild and you have been trying for a relatively short time, continuing naturally while correcting reversible factors is a legitimate plan rather than a delaying tactic.
Your consultation in Chennai
Bring the full printed report rather than a summary message, including the reference ranges and the abstinence period recorded by the laboratory. Bring older reports too; the trend across samples is often more informative than any single one.
You should leave understanding what each abnormal value means, whether it needs repeating, and what the next step is.
Written and medically reviewed by Dr. Vani Sundarapandian, MD, DGO, FRCOG (UK) — founder and Medical Director, Jananam Fertility Centre, Chennai.
