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The six-monthly ultrasound: what it is and why six months | CION Cancer Clinics
A six-monthly liver ultrasound is a routine scan for people with cirrhosis or some types of hepatitis B. It looks for liver cancer while it is small and has no symptoms, when treatment aimed at clearing it is far more likely. This page explains why the gap is six months, what happens at the scan, what the report means and who it does not apply to. At CION Cancer Clinics, our specialists help you understand your own risk and plan regular liver checks that fit it.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- What is the six-monthly liver ultrasound for?
- Why every six months, and not every year or every month?
- What happens at a surveillance ultrasound?
- What do the words on a surveillance report mean?
- What do families get wrong about surveillance scans?
- What this page cannot tell you
- Common questions about the six-monthly ultrasound
The short answer
What is the six-monthly liver ultrasound for?
It is a routine scan for people whose liver carries a higher chance of developing cancer, done twice a year whether or not they feel unwell. Its job is to find a liver cancer while it is still small, often before any symptom, when it is far more likely to be curable.
Who this page is about
This page is about primary liver cancer, the kind that starts in the liver itself, usually called hepatocellular carcinoma or HCC. It is for people with cirrhosis (a liver scarred by long-term damage), some people with hepatitis B, and their families. If a scan has already found cancer that spread to the liver from the bowel, breast or elsewhere, that is a different illness, and your oncologist follows it differently.
Why it matters so much
Liver cancer found on a routine scan is often small enough to remove, burn away or treat with the aim of clearing it. Liver cancer found because of pain, weight loss or yellow eyes is usually larger by then. The scan does not prevent cancer. It changes when it is found. See who needs liver cancer screening if you are unsure whether this applies to you.
Feeling well is not a reason to skip the scan. Early liver cancer usually causes no symptoms at all.The reasoning
Why every six months, and not every year or every month?
The interval is a balance between how fast these tumours tend to grow and what is practical to keep doing for years.
How fast the tumour grows
Most liver cancers take several months to grow from too small to see into something a scan can pick up. A six-monthly gap is short enough that a new tumour is usually still small at the next scan.
Why yearly is too long
Studies comparing intervals found that waiting a full year let more tumours grow past the size where the simpler treatments work well. Liver society guidelines settled on six months for this reason.
Why more often does not help
Scanning every few months has not been shown to find cancer at a better stage. It does mean more small, harmless spots get chased with extra scans, more worry and more cost.
Your doctor may shorten the gap for a while if something needs a closer look.Why the rhythm matters
The benefit comes from keeping going, year after year. One scan on its own tells you about today. The value is in the series, so a missed scan matters more than people think.
Not sure whether this applies to you?
Ask an oncologistOn the day
What happens at a surveillance ultrasound?
Come with an empty stomach
You are usually asked not to eat for a few hours beforehand, so the gallbladder and bowel do not block the view. Ask the centre for its own instructions when you book.
Gel and a probe on your belly
You lie on your back while the sonologist moves a probe over the right side of your upper abdomen. It uses sound waves, not radiation, and it does not hurt.
Breathe in and hold
You will be asked to hold your breath a few times so the liver moves down from under the ribs. The scan itself is quick.
The report
The report describes the liver's size, texture and any spot, called a lesion or nodule. Take it to the doctor who is following you. Do not file it away unread.
Book the next one before you leave
Put the date six months ahead in your phone straight away. Many missed scans happen simply because nobody set the next date.
On your report
What do the words on a surveillance report mean?
- Coarse echotexture
- The liver looks grainy rather than smooth. It is common in cirrhosis and is not a sign of cancer by itself.
- Nodular surface
- The outline of the liver is bumpy, which is how scarring shows on a scan. It describes the background liver, not a tumour.
- Focal lesion or SOL
- A spot that looks different from the rest of the liver. SOL means space-occupying lesion. Most need a further look, and many turn out to be harmless.
- No focal lesion
- Nothing new was seen. Keep to the six-monthly plan.
- Limited study
- The view was poor, often because of body fat, gas or a very scarred liver. Ask your doctor whether a different scan is needed next time.
- LI-RADS US category
- A grading some radiologists use to say whether the scan was clear, showed something small, or showed something that needs a CT or MRI.
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Did you know
Ultrasound alone can miss some small cancers, especially in a very scarred liver or in a heavier person. That is why many doctors pair it with an AFP blood test, and why a "limited study" on the report should always be mentioned to your doctor.
Commonly believed
What do families get wrong about surveillance scans?
"My last scan was normal, so I can skip this one."
A normal scan tells you about that day only. The risk comes from the liver itself and does not go away. A new tumour can appear between scans, which is the whole reason for the schedule.
"My liver tests are normal, so the liver is fine."
Routine liver blood tests can be normal in cirrhosis and in early liver cancer. They do not replace the scan.
"If I had cancer I would feel it."
Early liver cancer rarely causes pain, weight loss or jaundice. By the time it does, the tumour is usually larger and the choices are fewer.
"Once the hepatitis is treated, the scans can stop."
Treating hepatitis B or C lowers the risk but does not remove it, particularly if cirrhosis has already formed. Ask before stopping. See surveillance after hepatitis C treatment.
Being straight with you
What this page cannot tell you
It cannot tell you whether you personally need surveillance, or whether a spot on your report is cancer. Those answers depend on the state of your liver, your hepatitis history and the scan itself, read by the doctor following you.
Who this does not apply to
Most people with mild fatty liver and no scarring do not need six-monthly scans. People with advanced liver failure who could not have any liver cancer treatment may be told the scans would not change anything for them. People already treated for liver cancer follow a different schedule, usually with CT or MRI.
When the scan finds something
A new spot usually means a further scan, often a triple-phase CT or MRI, not an immediate diagnosis. Read a nodule was found on surveillance for what comes next. Do not wait for the next routine scan if you have been told to come back sooner.
CION arranges surveillance scans through accredited diagnostic partners, and its oncologists go through the results with you.Questions we are asked
Common questions about the six-monthly ultrasound
Is a six-monthly ultrasound enough to find liver cancer?
For most people at risk it is the standard approach recommended by liver societies, often paired with an AFP blood test. It is not perfect. Some small cancers are missed, especially when the view is poor. If your report says the study was limited, your doctor may suggest a CT or MRI instead.
Can I have a CT scan every six months instead?
CT and MRI are not the usual first choice for routine surveillance, because they cost more and CT carries radiation and contrast dye. They are used when ultrasound cannot see the liver well, or when something needs a closer look. Your doctor decides which suits you.
What if I am a few weeks late for my scan?
Book it as soon as you can and carry on from there. A short delay is far better than stopping altogether. What matters most is that the scans keep happening, year after year, rather than being dropped after one or two normal results.
Does the scan hurt or have side effects?
No. Ultrasound uses sound waves and carries no radiation. You may feel some pressure from the probe, especially if the liver is tender. It is safe to repeat as often as needed, including in older people and during pregnancy.
Do I need to see a doctor after every scan?
Someone qualified should read every report. If it says no focal lesion and nothing has changed, that may only need a short review. If anything new is mentioned, see your doctor promptly rather than waiting for the next routine visit.
Should I go to the same centre every time?
It helps. The same centre can compare with the previous scan and notice small changes. If you have to change, carry your old reports and, if possible, the images, so the new sonologist has something to compare against.
My father has cirrhosis. Should I be scanned too?
Not because of his cirrhosis alone. But if he has hepatitis B, family members should be tested for it, because it often passes within families. If you are found to carry it, your doctor will tell you whether surveillance applies to you.
How long do I have to keep doing this?
For most people with cirrhosis, for as long as they would be fit enough for treatment if a cancer were found. That is often many years. Talk to your doctor before stopping, and read whether surveillance can ever stop.
Your Specialists
Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.
Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- American Cancer Society — Can Liver Cancer Be Found Early?
- AASLD — Practice Guidelines
- Cancer Research UK — Diagnosing liver cancer
- Liver UK (formerly British Liver Trust) — Cirrhosis
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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Related pages
Talk to us
Not sure whether you should be on six-monthly scans?
Tell us about your liver condition and your last report. An oncologist can explain whether surveillance applies to you and help you set up the scans. One helpline serves every CION centre.