Semen analysis
A laboratory test of a sperm sample that checks the number, movement and shape of sperm, used to investigate male fertility.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A semen analysis checks the number, movement, vitality and shape of sperm, and is the main test of male fertility.
- Results vary a lot between samples, so one abnormal test does not mean infertility and is usually repeated after about three months.
- A normal result is reassuring but does not guarantee a pregnancy, because fertility depends on both partners.
- How the sample is produced and the gap since last ejaculation affect the result, so following the laboratory's instructions matters.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Provides the main measurement of male fertility, which is often overlooked.
Treating a single semen analysis as a diagnosis of infertility without a repeat.
Producing the sample takes a few minutes. You can carry on with your day as normal afterwards.
A clear explanation that a single result is interpreted alongside a repeat and the partner's tests.
Producing the sample takes a few minutes. You can carry on with your day as normal afterwards.
The laboratory reports the result, comparing it with World Health Organization reference values.
A repeat test is usually arranged, because new sperm take roughly three months to form, so a single low result is...
A clinician should explain what the results mean for you as a couple, and discuss options if a problem is...
What is a semen analysis?
A semen analysis is a laboratory test that examines a sample of semen to check the health of the sperm. It is the main test of male fertility and looks at things like how many sperm there are (concentration and total number), how well they move (motility), how many are alive (vitality) and what shape they are (morphology), as well as the volume of the sample.
It is done because problems with sperm are a common reason for difficulty conceiving, accounting for a large share of cases either on their own or alongside a partner's issue. Finding a problem can guide treatment and decisions about options such as IVF or ICSI.
A crucial point is that sperm results vary a lot from sample to sample, even in the same man, because they are affected by recent illness, fever, stress, the gap since the last ejaculation and many other factors. For this reason, one abnormal result does not mean you are infertile, and the test is usually repeated, typically after about three months, before any firm conclusion is drawn. A normal result is reassuring but does not guarantee a pregnancy, as fertility depends on both partners.
In the UK, semen analysis is done to standards set by the World Health Organization, fertility investigations are guided by NICE, and treatment is regulated by the HFEA.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
What a semen analysis can and cannot tell you
| Question | Semen analysis |
|---|---|
| Are the sperm numbers normal? | Gives a measurement |
| Is this result reliable on its own? | No, results vary; repeat if abnormal |
| Does normal mean we will conceive? | No, fertility involves both partners |
| Does abnormal mean infertile? | No, but it may guide options |
A semen analysis is one piece of a couple's assessment. A single result, good or bad, should be interpreted alongside repeat testing and the partner's investigations.
Preparing for your test
- Follow the laboratory's instructions on abstinence; typically you should not ejaculate for between 2 and 7 days before the test.
- Avoid producing the sample after a recent fever or illness, which can temporarily worsen results; ask whether to delay.
- Find out where to produce the sample; many labs prefer it on site, and a sample produced at home must reach the lab quickly and be kept warm.
- Use only the container provided, and do not use ordinary lubricants or condoms, which can harm sperm.
- Collect the whole sample, as the first part is often the richest in sperm; tell the lab if any is lost.
- Tell the clinician about medicines, supplements, recent illness and any testicular problems or surgery.
- Be prepared that an abnormal result is usually repeated before any conclusion, so try not to over-read a single test.
What happens
You produce a semen sample by masturbation into a sterile container provided by the laboratory. Many clinics have a private room for this; if you produce the sample at home, it usually needs to reach the laboratory within about an hour and be kept close to body temperature, so check the instructions carefully.
In the laboratory, the sample is examined, ideally within a short time of being produced. The scientists measure the volume, the sperm concentration and total number, how many sperm are moving and how well, how many are alive, and the proportion with a normal shape. The results are compared with World Health Organization reference values.
Results are usually available within about a week. Because a single sample can be misleading, an abnormal result is normally confirmed with a repeat test, ideally around three months later. A clinician should explain what the results mean for you as a couple, not just the numbers on the report.
Is this test right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Treating a single semen analysis as a diagnosis of infertility without a repeat.
- Using a normal result to rule out all problems when a couple is struggling to conceive.
- Testing soon after a fever or illness, which can temporarily worsen results.
- Buying extra sperm tests with weak evidence in place of a proper assessment.
Delay or rearrange if…
- You have recently had a fever or significant illness, which can temporarily lower sperm quality.
- You cannot follow the abstinence instructions (usually 2 to 7 days) for this test.
- You have new testicular pain, a lump or swelling that needs assessment first.
- You feel pressured into treatment based on one result you do not understand.
Alternatives to discuss
- A repeat semen analysis to confirm a result before acting on it.
- A specialist (andrology or urology) assessment if results are very abnormal.
- Hormone blood tests to look for a treatable cause of an abnormal result.
- Seeing your GP for NHS investigation of both partners if you have been trying to conceive.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Provides the main measurement of male fertility, which is often overlooked.
- Can identify a sperm problem that explains difficulty conceiving.
- Helps guide options such as lifestyle changes, IVF or ICSI.
- Can reassure when results are normal, as part of a couple's assessment.
- Is quick, non-invasive and widely available.
Risks & complications
- A single result being misleading, as sperm quality varies between samples
- False reassurance from a normal result, which does not guarantee a pregnancy
- Unnecessary worry from one abnormal result before it has been repeated
- A result affected by recent illness, fever or the gap since last ejaculation
- Embarrassment or stress around producing the sample, which is common and understandable
- An invalid result if the sample is incomplete, too old, or kept too hot or cold
- An abnormal result prompting tests or treatment that may not be needed
- A very abnormal result, such as no sperm seen, that needs careful specialist assessment and support
- Significant distress from results given without explanation or support
The biggest pitfall with a semen analysis is treating one result as the final word. Sperm quality naturally varies, and a poor sample can follow an illness or a short or long gap since last ejaculation. Ask how the sample was produced and timed, whether a repeat is needed, and what the result means for you as a couple. A very abnormal or absent-sperm result needs careful, supportive specialist assessment, not a snap judgement.
Published figures to discuss
A semen analysis is a low-risk test, so the important issue is not safety but reliability. Sperm quality varies considerably between samples in the same man, influenced by abstinence time, recent illness, fever and other factors. Because of this natural variation, a single result can be misleading, which is why an abnormal test is repeated and why fixed numerical 'accuracy' figures are not meaningful. The World Health Organization reference values below are population reference points, not pass-or-fail thresholds.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| WHO 2021 lower reference values (guide, not pass/fail) | Concentration about 16 million/ml or more; total motility about 42% or more; progressive motility about 30% or more; vitality about 54% or more; normal forms about 4% or more; volume about 1.4 ml or more | These are population reference points from the WHO sixth edition; being below one does not mean a man cannot father a child. | WHO 2021 semen reference values — analysis (PMC)ncbi.nlm.nih.govPublished figure |
| Natural sample variation | Common | Fever, abstinence time, illness, stress and collection problems can change results; abnormal tests are usually repeated. | Guide sourcesClinical context |
| False reassurance from a normal semen analysis | Recognised | A normal result does not rule out DNA fragmentation, erectile/ejaculatory problems, timing issues or female/tubal factors. | Guide sourcesClinical context |
| Collection or transport error | Common practical pitfall | Incomplete sample, wrong container, delay to lab or temperature exposure can make a result misleading. | WHO 2021 semen reference values — analysis (PMC)ncbi.nlm.nih.govSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no physical recovery from a semen analysis. The 'afterwards' is about waiting for results, often repeating the test if it is abnormal, and having the findings explained in the context of a couple's fertility.
- No physical after-effects and no need for time off
- Possible embarrassment or stress around the test, which is common
- Being advised to repeat the test if the first result is abnormal
- A wait of a few months if a confirmatory test is needed
Aftercare
- Ask for the result in writing, with the reference values used.
- If the result is abnormal, arrange the recommended repeat test rather than acting on one sample.
- Make sure the result is interpreted as part of a couple's assessment, alongside your partner's tests.
- Tell the clinician about any recent illness or fever that might have affected the sample.
- If you have been trying to conceive, ask your GP about NHS investigations for both partners.
- Take up support or counselling if a result is upsetting, especially if few or no sperm are found.
- A written result with the reference values used
- A repeat test arranged if the first was abnormal
- Your partner's assessment considered alongside yours
- A note of any illness or fever that might have affected the sample
- Your GP informed if relevant
- Support or counselling details if the result is distressing
⚠ Get urgent help if…
- Pain, a lump or swelling in the testicles, which should be checked promptly and separately
- A history of undescended testicles, testicular surgery or injury, which is worth telling the clinician
- Sudden severe testicular pain, which needs urgent same-day medical assessment
- Feeling very distressed by a result, when you should seek support
- Being pushed towards expensive treatment on the basis of a single result, which is a reason to pause
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
The report compares your sample with World Health Organization reference values. As a guide, the WHO sixth edition (2021) lower reference values include a sperm concentration of about 16 million per millilitre or more, a total motility of about 42% or more, progressive motility of about 30% or more, vitality of about 54% or more, and around 4% or more normally shaped sperm, with a semen volume of about 1.4 millilitres or more. These are reference points, not pass-or-fail lines, and being below one does not mean you cannot father a child.
A single result, normal or abnormal, should not be over-interpreted. An abnormal test is usually repeated, and a normal test does not guarantee conception because fertility depends on both partners. A specialist should explain what your results mean for your situation as a couple.
A semen analysis reflects sperm produced over the previous few months, so results can change over time and with health, illness or lifestyle. Because of this natural variation, results are a snapshot rather than a fixed measure of fertility. If a result is abnormal, it is repeated; if it is normal and you are still struggling to conceive, both partners may need further assessment.
Related tests, treatments or support
A semen analysis is one half of a couple's fertility assessment and is usually done alongside the partner's tests, such as hormone blood tests and ovarian reserve checks. If the result is abnormal, hormone blood tests for the man may be added, and a referral to a specialist in male fertility (an andrologist or urologist) may follow. A specialist should explain how the results fit together for both partners.
Follow-up & long-term care
If the result is abnormal, you will usually be offered a repeat test after about three months and, if a problem is confirmed, referral for further assessment and a discussion of options. If the result is normal, it still needs to be considered alongside your partner's investigations, as a couple, before deciding what to do next.
- Repeat testing only as advised, rather than testing repeatedly without a plan.
- Address modifiable factors, such as not smoking, limiting alcohol and a healthy weight, which can help sperm health.
- Mention any new illness, medicine or testicular symptom that could affect future results.
- Keep a copy of results to share with your GP or a male fertility specialist.
Repeat, follow-on and what comes next
- An abnormal result is normally repeated, ideally about three months later, before any conclusion.
- Results vary between samples, so the trend across tests matters more than one figure.
- A confirmed abnormal result usually leads to specialist assessment rather than immediate treatment.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A clear explanation that a single result is interpreted alongside a repeat and the partner's tests.
- A repeat test arranged when the first is abnormal, with appropriate timing.
- Onward referral to a male fertility specialist when results are very abnormal.
- Support or counselling offered when a result is distressing, such as when no sperm are found.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether it is a single test or includes the recommended repeat if abnormal.
- Whether a consultation to interpret the result is included.
- The laboratory used and whether it follows full World Health Organization methods.
- Whether additional specialist tests, such as DNA fragmentation, are added.
- Any hormone blood tests arranged if the semen result is abnormal.
- Follow-up consultations and any onward referral to a male fertility specialist.
- Whether the price covers one test or includes a repeat if needed.
- Whether a consultation to interpret the result is included.
- Which laboratory methods and reference values are used.
- The cost of any extra tests, such as DNA fragmentation, and the evidence for them.
- Follow-up consultation costs after the result.
- What happens, and what it costs, if the result is abnormal and needs further investigation.
On the NHS? Semen analysis is available on the NHS when fertility is being investigated, usually after a year of trying (or six months if the female partner is over 36); a self-requested test is often private.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Being told a single result is a diagnosis, without the need for a repeat being explained.
- Not being told that results vary between samples and can be affected by illness or abstinence time.
- Treating a normal result as proof a couple will conceive.
- Being moved quickly into IVF or ICSI on the basis of one uncertain result.
Marketing red flags
- Selling a one-off home sperm test as a complete fertility check.
- Quoting a result without reference values or the need to repeat it.
- Pushing extra, weakly evidenced sperm tests as routine.
- Implying a normal result guarantees a pregnancy.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- How should I produce and time the sample for the most reliable result?
- If this result is abnormal, when and how will it be repeated?
- Could a recent illness or other factor have affected my result?
- What does my result mean for us as a couple?
- If a problem is confirmed, what are my options and what does the evidence say?
- Should I see a specialist in male fertility?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my test, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this test not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Does one abnormal result mean I am infertile?
How long should I abstain before the test?
Can I produce the sample at home?
Why repeat the test after three months?
Does a normal result mean we will conceive?
Is a semen analysis available on the NHS?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Infertility: diagnosis NICE NG257 — Fertility problems: investigation and management HFEA — A-Z fertility glossary WHO 2021 semen reference values — analysis (PMC) Saint Mary's Hospital NHS — Diagnostic semen analysis
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
Related guides: Hormone blood tests (fertility) · Fertility assessment (fertility MOT) · AMH blood test (ovarian reserve) · IVF · Antral follicle count (AFC) scan