Thyroid ultrasound (Ultrasound scan of the thyroid gland and neck)
A usually not painful scan that uses sound waves to look at the thyroid gland in the neck, usually to check a lump or an abnormal thyroid blood test.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A thyroid ultrasound is a usually not painful, radiation-free scan used to check a thyroid lump or an abnormal thyroid blood test.
- It grades how worrying a nodule looks, but it cannot prove on its own whether a nodule is cancer - a needle sample is often needed.
- The scan itself takes about 15-30 minutes and there is no recovery; results may take longer if a biopsy is done.
- Most thyroid nodules are not cancer, so try not to assume the worst while you wait for results.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your radiologist will give you advice for your situation.
Gives a clear picture of thyroid nodules without radiation or injections in most cases.
Ultrasound is the wrong first test if the main question is how the thyroid is working - that needs a blood test.
You lie still with your neck tilted back for about 15-30 minutes while images are taken. It is usually not painful.
A clear written report stating nodule size, U grade and whether a biopsy is advised.
You lie still with your neck tilted back for about 15-30 minutes while images are taken. It is usually not painful.
You can go home and carry on as normal. If you had a needle biopsy, you may be asked to press on the site briefly...
The scan report is usually sent to the doctor who referred you, who will explain what it means and any next steps.
Cell sample results usually come back within a couple of weeks and are discussed with you, sometimes at a...
What is a thyroid ultrasound?
A thyroid ultrasound is a scan that uses high-frequency sound waves, not radiation, to make pictures of the thyroid gland in your neck. The thyroid is a small, butterfly-shaped gland that helps control how your body uses energy.
It is most often used to look more closely at a lump (nodule) you or a doctor can feel, to check the gland when a blood test is abnormal, or to look at neck glands. It can show whether a nodule is solid or filled with fluid, how big it is, how many there are, and whether it has features that are more often linked with thyroid cancer.
It is important to know what the scan cannot do. An ultrasound alone cannot tell for certain whether a nodule is cancer. It sorts nodules by how worrying they look, and a sample of cells (a needle biopsy) is often needed to get closer to an answer. Thyroid nodules are very common and most are not cancer.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Ultrasound compared with other thyroid tests
| Test | What it shows | Radiation |
|---|---|---|
| Ultrasound | Structure of nodules and gland; guides biopsy | None |
| Thyroid blood test | How the gland is working (overactive/underactive) | None |
| Radioactive (uptake) scan | Whether a nodule is 'hot' or 'cold' | Low dose |
| Needle biopsy (FNA) | Cell type; helps tell benign from cancer | None |
These tests answer different questions and are often used together rather than instead of each other.
Preparing for your scan
- No fasting or special preparation is usually needed for a thyroid ultrasound.
- Bring any recent thyroid blood test results and previous scans, as comparison is helpful.
- Wear a top with an open or loose neckline, or be ready to lower your collar.
- Take off necklaces and neck jewellery before the scan.
- Tell the team if you take blood-thinning medicines, in case a needle biopsy is planned the same day.
- Let the team know if you have had thyroid surgery, radiotherapy to the neck, or a family history of thyroid cancer.
- Allow extra time in case a biopsy is added after the scan.
What happens
You lie on your back with a pillow under your shoulders so your neck is gently tilted back. The sonographer or radiologist puts warm gel on your neck and moves a smooth hand-held probe over the skin. It does not hurt, though the position can feel a little awkward for a short time.
The scan looks at the size and texture of the thyroid, counts and measures any nodules, and checks features such as solid versus fluid areas, the edges of a nodule, and tiny specks of calcium. The neck lymph nodes may also be checked.
If a nodule looks indeterminate or suspicious, the team may offer a needle sample (fine needle aspiration) at the same visit or arrange one. For this, the skin is cleaned, a fine needle is guided into the nodule using the ultrasound, and a small sample of cells is taken to send to the laboratory.
Is this scan 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…
- Ultrasound is the wrong first test if the main question is how the thyroid is working - that needs a blood test.
- If an overactive thyroid is suspected, a radioactive (uptake) scan may be more useful than ultrasound for some nodules.
- Ultrasound cannot, on its own, confirm or exclude cancer, so it should not be used to give firm reassurance without considering biopsy where indicated.
- Routine scanning of the thyroid in people with no lump and normal blood tests is not generally recommended, as it finds many harmless nodules.
Delay or rearrange if…
- You have an active neck skin infection at a planned biopsy site.
- You take blood-thinning medicines that have not been reviewed before a planned biopsy.
- You are acutely unwell and the scan is not urgent.
- Important previous scans or blood tests are missing and would change interpretation.
Alternatives to discuss
- Thyroid blood tests to assess gland function rather than structure.
- Radioactive (uptake) scan when an overactive nodule is suspected.
- Watchful waiting with clinical review for small, clearly benign-feeling lumps, on specialist advice.
- CT or MRI of the neck in selected cases, usually arranged by a specialist.
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 picture of thyroid nodules without radiation or injections in most cases.
- Helps sort nodules into lower-risk and higher-risk groups to guide what happens next.
- Can guide a needle biopsy accurately when a sample is needed.
- Can reassure when nodules look benign, reducing unnecessary worry or surgery.
- Useful for monitoring known nodules or following up after thyroid cancer treatment.
Risks & complications
- Mild discomfort from the neck position or the probe pressing on the throat.
- Finding small, harmless nodules that then need monitoring (so-called incidental findings).
- Needing a follow-up scan or biopsy to clarify an uncertain result.
- An indeterminate biopsy result that does not give a clear answer and needs repeating.
- Bruising or tenderness at the needle site if a biopsy is taken.
- Temporary anxiety while waiting for biopsy results.
- Small bleeding or infection at a biopsy site.
- A nodule that looks benign on the scan but later proves not to be (no test is perfect).
The main limitation is that ultrasound describes how a nodule looks but cannot, by itself, confirm or rule out cancer. Even biopsy results can be indeterminate. Ask the person scanning you what U grade your nodule is, whether a biopsy is needed, and what the plan is if the result is unclear.
Published figures to discuss
The chance that a thyroid nodule is cancer rises with the ultrasound U grade, but the figures below come from UK series and vary between studies and populations. They describe groups, not individuals, and should be interpreted by your specialist alongside biopsy and blood tests.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Cancer in benign-looking nodules (U2) | Around 1 in several hundred in one UK validation series (about one cancer among 894 U2 nodules) | Low, but not zero; benign-looking does not mean a guarantee. | Ultrasonography of thyroid nodules: a pictorial review (PMC)ncbi.nlm.nih.govPublished figure |
| Cancer in indeterminate nodules (U3) | Roughly 1 in 10 to 1 in 12 in UK series (about 20 of 256 in one study) | This uncertainty is why a needle biopsy is usually offered for U3 nodules. | Ultrasonography of thyroid nodules: a pictorial review (PMC)ncbi.nlm.nih.govPublished figure |
| Cancer in suspicious or malignant-looking nodules (U4-U5) | Roughly 4 to 6 in 10 in UK series (about 22 of 51 U4 and 14 of 24 U5 in one study) | Higher-grade nodules are more likely to be cancer and usually need biopsy and specialist review. | Guide sourcesClinical 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 scan itself. If you have a needle biopsy, the neck may feel a little tender for a day or so. The wait is mostly for results.
- No after-effects at all from the scan in most people.
- A little tenderness or bruising in the neck if a needle biopsy was done.
- Some natural worry while waiting for results - this is normal.
- No change to your voice, swallowing or breathing from the scan itself.
Aftercare
- Carry on with normal activities after the scan unless told otherwise.
- If you had a biopsy, keep the small dressing on as advised and avoid heavy lifting that day.
- Take simple pain relief such as paracetamol if the biopsy site is sore, if it suits you.
- Make sure you know who will give you the results and when.
- Keep a copy of your report and any U grade for your records and future comparison.
- Attend any follow-up scan or clinic appointment that is arranged.
- Previous thyroid blood tests gathered
- Any earlier scans or reports brought along
- Neck jewellery left at home or easy to remove
- Loose or open-neck top worn
- Clear who will give results and when
- List of current medicines, including blood thinners
⚠ Get urgent help if…
- Rapidly growing neck lump, or a lump that becomes hard and fixed.
- A hoarse voice that does not settle, or trouble swallowing or breathing.
- Heavy or continuing bleeding, marked swelling or severe pain at a biopsy site.
- Fever, spreading redness or heat at a biopsy site (possible infection).
- Coughing up blood or a sudden large neck swelling after a biopsy.
- Any new lump in the neck while you are waiting for results.
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 radiologist gives you.
Results & realistic expectations
A normal or benign-looking scan is reassuring, and many people simply need occasional monitoring or no further action. A nodule graded as indeterminate, suspicious or malignant-looking usually leads to a needle biopsy and a specialist review.
No single result is a final answer. A benign-looking scan greatly lowers the chance of cancer but does not make it zero, and a needle sample can come back unclear. Your clinician will combine the scan, any biopsy, your blood tests and your symptoms to decide what happens next.
An ultrasound is a snapshot in time. If you have nodules that need watching, you may be offered repeat scans over months or years to check for change. How long a result stays useful depends on your nodules and any symptoms, so follow the monitoring plan your specialist gives you.
Related tests, treatments or support
A thyroid ultrasound is often done alongside thyroid blood tests, and sometimes with a needle biopsy at the same visit. In some cases a radioactive (uptake) scan is added when blood tests show an overactive gland. Your clinician will explain which combination is right for your situation.
Follow-up & long-term care
The report normally goes to the doctor who referred you, who will explain the result and arrange any biopsy, repeat scan or specialist referral. If a biopsy was taken, results are usually discussed within a couple of weeks, sometimes at a thyroid or head-and-neck clinic.
- Attend any repeat ultrasound scans arranged to monitor nodules over time.
- Keep up with thyroid blood tests if your gland is over- or under-active.
- Report any new or growing neck lump, voice change or swallowing difficulty promptly.
- Keep copies of reports so future scans can be compared accurately.
Repeat, follow-on and what comes next
- Some scans lead to a repeat ultrasound to watch a nodule for change over time.
- Needle biopsies can be inadequate or indeterminate and may need to be repeated.
- An uncertain biopsy result sometimes leads to diagnostic surgery to remove part of the thyroid for a clearer answer.
- Monitoring plans can change as nodules grow, shrink or stay stable.
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 written report stating nodule size, U grade and whether a biopsy is advised.
- A named route to get results and ask questions.
- A defined monitoring plan with timing if repeat scans are needed.
- Prompt specialist referral if a nodule is indeterminate, suspicious or malignant-looking.
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 the scan is a simple thyroid ultrasound or includes the neck lymph nodes.
- Whether a radiologist or sonographer performs and reports it, and how quickly the report is issued.
- Whether a needle biopsy (fine needle aspiration) is added on the day.
- Laboratory fees for analysing any cell samples taken.
- Whether a follow-up consultation with a specialist is included.
- Whether repeat scans for monitoring are needed over time.
- The fee for the ultrasound scan and its written report.
- Whether a needle biopsy is included or charged separately if needed.
- Laboratory and reporting fees for any biopsy sample.
- Who reports the scan and when the result will be available.
- Any follow-up appointment or repeat scan costs.
- What happens, and what it costs, if the result is inconclusive and further tests are needed.
On the NHS? Thyroid ultrasound is commonly available on the NHS when clinically indicated, such as a thyroid lump or abnormal blood test; private scans are mainly used for speed or convenience.
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 given firm reassurance from the scan alone without explaining its limits.
- Not being told whether a biopsy is recommended and why.
- No clear plan for who explains results and what happens if they are unclear.
- Not understanding that incidental nodules are common and often need only monitoring, not treatment.
Marketing red flags
- Claims that an ultrasound can definitely rule out thyroid cancer.
- Private 'thyroid screening' offered to people with no symptoms as a way to catch everything.
- Pressure towards surgery on the basis of a scan alone, without biopsy or specialist input.
- Downplaying the chance of incidental findings that lead to more tests and worry.
Choosing a specialist safely
- Check the radiologist 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 radiologist 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 radiologist will welcome every one of these.
- What U grade is my nodule, and what does that mean for me?
- Do I need a needle biopsy, and why or why not?
- What will this result change about my care?
- What happens if the scan or biopsy result is normal, abnormal or unclear?
- Should this nodule be monitored, and how often?
- Who will give me the results, and when?
- 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 radiologist who carries out my scan, 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 scan 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
Is a thyroid ultrasound available on the NHS?
Does a thyroid ultrasound hurt?
Can the scan tell me if I have cancer?
What is a U grade?
Will I need a biopsy?
How soon will I get results?
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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 - Thyroid cancer (diagnosis and tests) NICE NG145 - Thyroid disease: assessment and management BTA ultrasound U classification - real-world validation (Clinical Radiology) Ultrasonography of thyroid nodules: a pictorial review (PMC) British Thyroid Foundation - Thyroid nodules and swellings
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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