Sperm Test

A sperm test is the single most informative investigation in male fertility, and it is also the one most often misread — by patients and sometimes by the clinics reporting it. If you are holding a page of numbers with a few of them flagged in red, this guide explains what each line measures, what the reference figures actually are, and why one poor result is not a diagnosis.

On this page

• What a sperm test measures
• Giving the sample properly
• The WHO 2021 reference limits
• Why your report may look worse than it is
• Reading your sperm test line by line
• Why one result is not a diagnosis
• If the report says no sperm were seen
• Tests beyond the basic sperm test
• What happens next
• Questions patients ask

What a sperm test measures

A basic sperm test — also called a semen analysis or seminal fluid analysis — is a laboratory examination of one ejaculated sample. It records volume, how many sperm are present per millilitre, how many there are in total, how many are moving and how well, how many are correctly shaped, and how many are alive.

It also notes acidity, how quickly the sample liquefies, and whether white cells are present in numbers suggesting infection. None of these are pass or fail measures. They are positions on a distribution.

Our fuller account of how the laboratory handles the specimen, and what happens in the andrology room, sits on the seminal fluid analysis page. This page concentrates on the report itself: how to read the sperm test you already have in your hand.

Giving the sample properly

Half the bad reports we see are collection problems, not fertility problems. Four rules:

• Abstain for two to seven days. Less than two lowers the count; more than seven lowers motility
• Collect the whole ejaculate. The first fraction carries most of the sperm, so a spilled start halves the apparent count
• No lubricant, no condom, no saliva — all are toxic to sperm
• Get it to the laboratory within an hour, kept near body temperature, never refrigerated

A fever in the previous three months matters too. Spermatogenesis takes about seventy-four days, and a week of high temperature can depress a sperm test taken two months later.

The WHO 2021 reference limits

The World Health Organization publishes lower reference limits derived from men whose partners conceived within twelve months. The sixth edition, published in 2021, gives these fifth-centile values:

• Semen volume: 1.4 ml
• Sperm concentration: 16 million per ml
• Total sperm number: 39 million per ejaculate
• Total motility: 42%
• Progressive motility: 30%
• Normal morphology: 4%
• Vitality: 54% alive

Read the phrase carefully: fifth centile. Ninety-five per cent of men who fathered a child within a year were above these figures, which means five per cent of men who had already fathered a child were below them. The limits describe a reference population; they do not define fertility.

Why your report may look worse than it is

The fifth edition of the WHO manual, published in 2010, set the limits slightly differently: volume 1.5 ml, concentration 15 million per ml, total sperm 39 million, progressive motility 32%, morphology 4%, vitality 58%. Many Indian laboratories still report against the 2010 figures.

The practical consequence is that the same sample can be flagged abnormal by one laboratory and normal by another purely because of which edition sits in the report template. Before you worry about a borderline value, check which edition your sperm test was compared against. It should be printed on the page; if it is not, ask.

Reading your sperm test line by line

Volume. Low volume usually means an incomplete collection or short abstinence. Persistently under 1 ml with a normal count raises the question of retrograde ejaculation or an obstruction.

Concentration and total count. Total number matters more than concentration, because concentration is simply count divided by volume. A count below 16 million per ml is oligospermia. It is a description of severity, not a verdict.

Motility. Progressive motility — sperm swimming forward rather than twitching in place — is the number that correlates most usefully with natural conception. Low motility with a normal count often reflects transport delay to the laboratory.

Morphology. A figure like 3% normal forms alarms everybody and should not. Strict Kruger criteria are harsh; the reference limit is only 4%, so normal men have mostly abnormal-looking sperm.

Pus cells. Above one million white cells per ml suggests genital tract inflammation and is worth a culture.

One habit is worth adopting. Write your own figures next to the reference values rather than relying on the red flags, and note the abstinence period and the time between collection and analysis at the top. Two sperm test reports compared that way tell a story; two sets of red flags compared without that context tell you almost nothing.

Why one result is not a diagnosis

Sperm output varies substantially in the same man from week to week. Illness, sleep debt, alcohol, heat, recent travel and stress all move the numbers. That is why an abnormal sperm test is repeated after eight to twelve weeks before any conclusion is drawn, and why we never plan treatment on a single report.

Equally, a normal report does not guarantee normal sperm function. Routine analysis says nothing about DNA integrity or the ability to fertilise, which is why a couple can have perfect numbers and still not conceive.

If the report says no sperm were seen

Azoospermia on a first sample is frightening and frequently wrong. The sample must be centrifuged and the pellet re-examined before the term is used at all, and the finding must be confirmed on a second sample.

If confirmed, the distinction that matters is whether the testis is producing sperm that cannot get out, or not producing them. That is separated by hormone tests, examination and scrotal ultrasound — see obstructive azoospermia and non-obstructive azoospermia. Sperm can often still be retrieved surgically and used with ICSI.

Tests beyond the basic sperm test

Additional tests are offered selectively, where the result would change a decision, not as a routine panel. DNA fragmentation testing is considered after recurrent miscarriage or repeated fertilisation failure. Hormone profiles, karyotype and Y-chromosome microdeletion screening belong with severe oligospermia or azoospermia. A post-ejaculation urine screen is used when volume is very low.

What happens next

At Jananam both partners are evaluated before any plan is made. A sperm test is read next to the female assessment, because the same numbers mean different things depending on the woman’s age and tubal status.

Mild abnormalities often need lifestyle correction, treatment of a varicocele or infection, and a repeat test. Moderate ones may be managed with insemination. Severe deficits point towards ICSI, where a single sperm is injected into each egg. The NHS infertility overview and the WHO laboratory manual are both worth reading in your own time.

Questions patients ask

Can I improve my numbers?

Often, partly. Stopping smoking and tobacco, reducing alcohol, treating infection, avoiding prolonged heat and correcting significant obesity all help. Expect three months before a repeat sperm test reflects the change.

Are home kits reliable?

They measure concentration only, and concentration is the least informative single figure. A normal home result with poor motility is a common trap.

How many times should it be repeated?

Two samples, eight to twelve weeks apart, are usually enough. More than that rarely adds information.

Does a bad result mean donor sperm?

Very rarely. Even severely abnormal results are usually treatable with the man’s own sperm, including after surgical retrieval.

Written and medically reviewed by Dr. Vani Sundarapandian, MD, DGO, FRCOG (UK) — founder and Medical Director, Jananam Fertility Centre, Chennai.