Glandular fever assessment (Infectious mononucleosis assessment (Epstein-Barr virus))
An assessment, usually including a blood test, to find out whether a sore throat, fever and swollen glands are caused by glandular fever (the Epstein-Barr virus).
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- It is a check, usually with a blood test, to see whether your symptoms are glandular fever rather than tonsillitis or another infection.
- There is no cure and antibiotics do not help; the test mainly gives a clear diagnosis and the right safety advice.
- Most people feel very unwell for 2-4 weeks and tiredness can linger for longer - this is normal and not a sign the test was wrong.
- Because the spleen can swell, you should avoid contact and collision sports for several weeks - ask your doctor when it is safe to restart.
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.
Gives a clear answer about whether your illness is glandular fever
You have severe breathing difficulty, cannot swallow your own saliva, or are severely dehydrated - this needs urgent or emergency care, not a routine test.
You go home with advice on rest, fluids and painkillers. Most blood results take a few days; the doctor will say how you will get them.
Clear, written safety advice about spleen injury, swallowing and dehydration, with an urgent contact route.
You go home with advice on rest, fluids and painkillers. Most blood results take a few days; the doctor will say...
This is often the worst period: high temperature, very sore throat, swollen glands and marked tiredness. Rest and...
Most people slowly start to feel better. You can return to school or work as you start to feel up to it, building...
Because the spleen can be enlarged, contact and collision sports and heavy lifting are usually avoided for several...
What is a glandular fever assessment?
A glandular fever assessment is the way a doctor works out whether your symptoms - usually a bad sore throat, high temperature, swollen neck glands and a lot of tiredness - are caused by glandular fever. Glandular fever is an infection, most often from the Epstein-Barr virus (EBV), and it is sometimes called infectious mononucleosis or 'mono'.
The assessment is a conversation and an examination, usually with a blood test. The doctor feels your neck and tummy (an enlarged spleen is common), looks at your throat, and may take blood. The blood can be checked for a 'mononucleosis' reaction (a Monospot or Paul-Bunnell test), for antibodies to EBV, and for a full blood count that often shows a particular pattern.
The main job of the test is to tell glandular fever apart from things that are treated differently, such as bacterial tonsillitis. It is also a safety check: glandular fever can affect the liver, the blood and, rarely, the spleen, so knowing the diagnosis changes the advice you are given.
A test cannot make you better. There is no cure for glandular fever - it is a viral illness that your body clears over time. The value of the assessment is a clear diagnosis, the right safety advice, and avoiding unnecessary antibiotics.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Glandular fever vs ordinary tonsillitis
| Feature | Glandular fever | Bacterial tonsillitis |
|---|---|---|
| Usual cause | Epstein-Barr virus | Bacteria (often strep) |
| Tiredness | Often severe and lasting | Usually mild |
| Antibiotics | Do not help | May help |
| Spleen | Often enlarged | Not affected |
| Typical length | 2-4 weeks or more | About a week |
The two can look similar early on, which is exactly why a blood test is sometimes used. Taking antibiotics (especially amoxicillin) when the cause is actually glandular fever can trigger a widespread rash.
Preparing for your test
- Make a note of when your symptoms started, as some blood tests are more accurate after the first week of illness.
- List any medicines and supplements you take, and mention any recent antibiotics.
- Mention if you have recently been abroad, so other infections can be considered.
- Tell the doctor if you do contact or collision sport, or heavy lifting, so they can advise on the spleen.
- Bring details of any liver, blood or immune conditions you have.
- You do not usually need to fast for these blood tests, but check when booking.
What happens
The doctor asks about your sore throat, fever, tiredness and how long you have felt unwell, then examines your throat, the glands in your neck, and gently presses your tummy to feel whether the spleen is enlarged. They will look for a rash.
If a blood test is needed, a small sample is taken from your arm. It may be checked for a mononucleosis reaction (Monospot), for EBV antibodies, for a full blood count, and for liver function. Sometimes a throat swab is taken to look for bacteria as well.
You go home the same day. The doctor will explain what to do while you wait for results - rest, fluids and simple painkillers - and give you safety advice about your spleen and when to seek urgent help.
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…
- You have severe breathing difficulty, cannot swallow your own saliva, or are severely dehydrated - this needs urgent or emergency care, not a routine test.
- Your symptoms point clearly to a different, treatable cause that needs its own pathway.
- You are testing extremely early, before antibodies have developed, when a negative result would not be reliable.
- You simply want reassurance about lasting tiredness long after a confirmed infection, when repeat EBV testing rarely adds anything.
Delay or rearrange if…
- It is the first day or two of illness and a Monospot is likely to be falsely negative - the doctor may wait a few days.
- You are acutely unwell and need urgent assessment first rather than a routine outpatient test.
- You have just taken antibiotics that could complicate the picture, which the doctor should know about.
- Practical access to urgent help is not in place if your symptoms worsen.
Alternatives to discuss
- A clinical diagnosis without blood tests when the picture is typical and you are improving.
- A throat swab and treatment pathway if bacterial tonsillitis is the more likely cause.
- Watchful waiting with safety-netting advice for a few days before testing.
- Referral to ENT or infection specialists if the throat is severely swollen or the illness is unusual.
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
- Gives a clear answer about whether your illness is glandular fever
- Helps tell it apart from bacterial tonsillitis, so you avoid antibiotics you do not need
- Picks up effects on the liver or blood that may need monitoring
- Leads to the right safety advice, including about the spleen and contact sport
- Reassures you that long-lasting tiredness has a known cause
Risks & complications
- Brief discomfort, bruising or a small lump where blood is taken
- A test done very early in the illness can come back negative even when you do have glandular fever, so it may need repeating
- Mildly abnormal liver results that cause worry but usually settle on their own
- A false-negative Monospot, especially in the first week or in young children, leading to a missed or delayed diagnosis
- Being given amoxicillin for a presumed bacterial sore throat, which can cause a widespread rash if it is really glandular fever
- Needing a repeat or different blood test to be sure
- A false-positive result that briefly suggests glandular fever when another condition is responsible
- Anxiety from an incidental finding on the blood tests that turns out to be unimportant
The biggest pitfalls are testing too early (which can miss the diagnosis) and being treated with antibiotics for a sore throat that is actually glandular fever. The most important safety issue is not the test itself but the enlarged spleen: ask your doctor when it is safe to return to contact sport, heavy lifting and vigorous exercise.
Published figures to discuss
Test accuracy depends heavily on timing. The Monospot (heterophile antibody) test is often negative in the first week and in young children, so a negative early result does not exclude glandular fever. EBV-specific antibody testing is more reliable but takes longer and is interpreted alongside the clinical picture. We have not put exact percentages here because reported figures vary with the test used and how early it is taken, and over-precise numbers could mislead.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Monospot false negative early in illness | Common in the first week and in younger children | A negative early heterophile antibody test does not exclude EBV; EBV-specific serology may be needed. | Guide sourcesClinical context |
| Fatigue lasting weeks to months | Common recovery pattern | Most people recover gradually, but tiredness can outlast fever and sore throat. | Guide sourcesClinical context |
| Spleen enlargement and rupture | Rupture is rare but serious | Contact sports and heavy lifting are usually avoided for several weeks because spleen enlargement can occur. | Guide sourcesClinical context |
| Rash after amoxicillin/ampicillin | Recognised pitfall | An antibiotic rash during EBV is common enough that penicillin antibiotics are avoided unless bacterial infection is clear. | NHS - Glandular fevernhs.ukSource-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 the blood test itself - the 'recovery' that matters is from the glandular fever illness, which often takes weeks. This section explains what to expect afterwards.
- Feeling drained and needing far more sleep than usual
- A sore throat and swollen neck glands that take a couple of weeks to settle
- Reduced appetite and feeling generally washed out
- Tiredness that comes and goes for several weeks after the worst is over
- A short period where exercise feels much harder than normal
Aftercare
- Rest as much as you need and return to activity gradually rather than all at once.
- Drink plenty of fluids, especially while your throat is sore and swallowing is hard.
- Use paracetamol or ibuprofen for pain and fever, following the label.
- Avoid alcohol while you are unwell and your liver results are abnormal, as glandular fever can affect the liver.
- Avoid contact and collision sports and heavy lifting until your doctor confirms it is safe, because of the risk of injuring an enlarged spleen.
- Do not share cups, cutlery or toothbrushes, and avoid kissing while you feel unwell, as the virus spreads through saliva.
- Do not give blood while you are recovering.
- Arrange a review if tiredness is severe, if symptoms last beyond the expected time, or if you feel worse rather than better.
- A note of when your symptoms started
- Simple painkillers (paracetamol/ibuprofen) at home
- Soft, easy-to-swallow food and plenty of drinks
- Time off work or school arranged
- A plan to pause contact sport and heavy lifting
- A clear way to get your blood results
- A way to get urgent advice: NHS 111 if you are in England, Scotland or Wales, or - in Northern Ireland - your GP out-of-hours service or your HSC Trust's Phone First number (and 999 or A&E for anything life-threatening)
⚠ Get urgent help if…
- Sudden severe pain in the upper left side of your tummy or the tip of your left shoulder - this can signal a problem with the spleen and needs emergency help (call 999).
- Difficulty breathing, noisy breathing or trouble swallowing your own saliva because the throat is very swollen.
- Being unable to drink enough to stay hydrated, or passing very little urine.
- Yellowing of the skin or eyes, or very dark urine (possible liver involvement).
- A widespread rash, especially after taking antibiotics.
- Severe headache, a stiff neck, confusion, or new weakness or facial drooping.
- Feeling faint, a racing heartbeat, or feeling dramatically worse rather than slowly better.
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
A positive Monospot or EBV antibody result, with the typical blood-count picture, confirms glandular fever. That tells you the cause is viral, that antibiotics will not help, and that the illness will clear in its own time. A negative test does not always rule it out, particularly very early on, so the doctor may repeat the test or look for another cause.
A diagnosis cannot tell you exactly how long you will feel unwell, and it cannot speed up recovery. Its real value is a clear explanation, the right safety advice about your spleen and liver, and protection from treatments you do not need.
Once you have had glandular fever you usually develop long-lasting immunity to the Epstein-Barr virus and do not get the same illness again. The virus stays dormant in the body for life, as it does in most adults, but this is normal and not usually a cause for concern. A past-infection blood pattern can remain detectable for years, which is why timing and interpretation of tests matter.
Related tests, treatments or support
The assessment is often done alongside a throat swab to check for bacteria, and with liver and full blood count tests to look for the common effects of the virus. If you have recently travelled or have unusual features, the doctor may also consider other infections at the same time.
Follow-up & long-term care
Most people do not need routine follow-up once the diagnosis is clear and they are improving. A review is sensible if your liver results were abnormal (to check they settle), if tiredness is severe or prolonged, if your spleen was notably enlarged, or if you are unsure when it is safe to return to sport. Worsening or persistent symptoms should always be reassessed.
Repeat, follow-on and what comes next
- A negative early test may need repeating after several days, or replacing with EBV-specific serology.
- Mildly abnormal liver results often need one repeat check to confirm they are settling.
- If symptoms persist or worsen, the diagnosis should be revisited and other causes considered.
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
- Clear, written safety advice about spleen injury, swallowing and dehydration, with an urgent contact route.
- A defined plan for getting and interpreting blood results.
- Specific guidance on when to return to sport, work or school.
- A review arranged if liver results were abnormal or if tiredness is severe or prolonged.
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 you see a GP or a specialist, and the length of the appointment
- Which blood tests are done (Monospot, EBV antibodies, full blood count, liver tests)
- Whether a throat swab or extra tests are added
- How quickly results are processed and reported
- Whether a follow-up appointment is needed to recheck liver or blood results
- The consultation fee and how long the appointment lasts
- Which blood tests are included and the laboratory fee
- Whether result interpretation and a written summary are included
- The cost of any repeat or additional tests if the first is inconclusive
- Whether a follow-up review is included or charged separately
- What happens, and what it costs, if you need onward referral
On the NHS? Glandular fever is routinely assessed and tested on the NHS when clinically suspected; private appointments are mainly used for speed, convenience or a second opinion.
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
- Not being told that a negative early test does not rule out glandular fever.
- Being prescribed antibiotics (especially amoxicillin) for a sore throat without considering glandular fever and the rash it can cause.
- No clear advice about the spleen and when contact sport can resume.
- No plan for who interprets the results or what happens if they are abnormal.
Marketing red flags
- Offers of antiviral medicines or supplements that 'cure' or 'clear' glandular fever - none are proven to do this.
- Repeat or expensive EBV testing marketed for unexplained long-term tiredness without clinical justification.
- Claims that a single test can predict exactly how long you will be ill.
- Pressure to pay for treatments aimed at 'chronic EBV' without specialist assessment.
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.
- Based on my symptoms and timing, do I need a blood test now or should it be repeated later?
- Were my liver or blood results affected, and do they need rechecking?
- Is my spleen enlarged, and when will it be safe to return to contact sport and heavy lifting?
- What symptoms should make me seek urgent help?
- How long might my tiredness last, and when should I come back if I am not improving?
- 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
Can I get a glandular fever test on the NHS?
Is there a cure or a tablet that clears it faster?
Why can't I play rugby or football for a while?
How long will I feel ill?
Could the test be wrong?
Can I drink alcohol while I recover?
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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 - Glandular fever NHS Scotland Right Decisions - Glandular fever NICE CKS - Glandular fever (infectious mononucleosis) Patient information - Infectious mononucleosis (East Kent Hospitals NHS) nidirect — Urgent and emergency care services nidirect — GP out-of-hours service
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.
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