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What AFP is and what the test actually measures | CION Cancer Clinics
AFP, or alpha-fetoprotein, is a protein that a baby makes before birth and an adult makes very little of. Some liver cancers switch it back on, so doctors use it as a clue alongside a scan. Hepatitis and cirrhosis can raise it too, and many liver cancers never do. This page explains what the test measures and how to read it. At CION Cancer Clinics, our team goes through your scan, blood test and biopsy reports with you and plans the next step.
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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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The short answer
What is AFP, and why did the doctor order it?
AFP, short for alpha-fetoprotein, is a protein in the blood. A baby makes large amounts of it before birth, and the level falls to very little within the first year of life. In an adult, a raised AFP can come from liver cells that are healing or multiplying, and sometimes from liver cancer or certain other tumours.
Why it is called a tumour marker
Some liver cancers, known as hepatocellular carcinoma or HCC (cancer that starts in the liver's own cells), switch the baby protein back on. That is why AFP is used as a marker. A marker is a clue in the blood. It is not a diagnosis, and it does not see a tumour the way a scan does.
The three jobs it is usually asked to do
Doctors order AFP alongside an ultrasound when someone with cirrhosis or hepatitis B is being watched for liver cancer. They order it when a scan has found a spot in the liver, to add one more piece of evidence. And they order it after treatment, to see whether a level that was high has come down and stays down.
This page is about cancer that starts in the liver. If you have been told cancer has spread to the liver from the bowel, breast or elsewhere, AFP is usually not the marker that matters for you.Where AFP comes from
What can make AFP go up in an adult?
Several things raise AFP, and most of them are not cancer. That is the single most important fact on this page.
A liver that is inflamed or healing
Active hepatitis B or C, a flare of hepatitis, alcohol-related hepatitis and cirrhosis can all push AFP up. Liver cells that are repairing damage can make some of the protein again.
This is the most common reason for a mildly raised value in a person with liver disease.Pregnancy
AFP rises naturally when a woman is pregnant, because the baby makes it. Pregnancy results are read on a different scale and for a different purpose, so they cannot be compared with a liver report.
Liver cancer
Many, though not all, hepatocellular carcinomas make AFP. A level that is high and keeps climbing deserves a proper scan.
Often goes with
- A known liver condition such as cirrhosis or hepatitis B
- A rising trend over repeated tests
- A spot seen on ultrasound or CT
Other tumours
Some germ cell tumours of the testis or ovary, and hepatoblastoma in young children, also make AFP. These are looked after by different teams and are not what this page is about.
Not sure whether this applies to you?
Ask an oncologistFrom test to decision
How is an AFP result actually used?
A simple blood sample
AFP is measured from blood taken from a vein in the arm. You do not usually need to fast for it. The result comes as a number with the laboratory's own reference range printed beside it.
Read with the scan, not alone
For people under liver surveillance, AFP is read together with the ultrasound. Our page on why ultrasound and AFP are used together explains why neither is enough on its own.
Compared with your earlier values
One number says little. The doctor looks at whether it is steady, slowly drifting or climbing fast. A rising pattern matters far more than a single reading.
A scan if something looks wrong
If AFP is rising or the ultrasound shows a spot, the usual next step is a triple-phase CT or MRI, a scan that photographs the liver at several moments after a dye injection. CION arranges these through partner diagnostic centres.
Tracking after treatment
When a cancer made AFP before treatment, the level is checked again afterwards. A fall is reassuring. A later rise prompts a scan to look for the reason.
On your report
What do the words next to AFP mean?
- Alpha-fetoprotein (AFP)
- The protein being measured. Sometimes written as serum AFP, meaning it was measured in the liquid part of the blood.
- Reference range
- The range the laboratory expects in healthy adults. Different laboratories and machines use slightly different ranges, so always read your value against the range printed on your own report.
- ng/mL or IU/mL
- The unit the result is given in. Two labs may report the same blood in different units, which is one reason values from different labs should not be compared directly.
- AFP-L3
- A particular form of AFP, sometimes measured as a share of the total. It is ordered less often and is explained on our page about AFP-L3 and DCP.
- Tumour marker
- A substance in the blood that can be linked with a cancer. Markers help track a known cancer. They cannot prove or rule out cancer on their own.
- HCC
- Hepatocellular carcinoma, the most common cancer that starts in the liver itself. This is the cancer AFP is most often used for.
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Commonly believed
What do families get wrong about AFP?
"The AFP is high, so it must be cancer."
Hepatitis flares and cirrhosis raise AFP often. A high value is a reason for a proper scan and a conversation with the doctor. It is not a diagnosis, and many people with a raised AFP turn out not to have cancer.
"The AFP is normal, so there is no cancer."
Many liver cancers, especially small early ones, never raise AFP at all. A normal result does not cancel a surveillance ultrasound or a scan your doctor has asked for. Our page on normal AFP with liver cancer explains why.
"Healthy people should get AFP checked every year in a package."
For someone with no liver disease, a stray result causes worry and more tests without real benefit. AFP is useful in people with a known reason to be watched, such as cirrhosis or hepatitis B.
"If I repeat it at another lab, I will get the true number."
Labs use different machines and sometimes different units. Switching labs often makes the trend harder to read. Where you can, keep repeat tests at the same laboratory.
Being straight with you
What can this page not tell you about your AFP?
It cannot tell you what your own number means. The same value can be expected in one person with active hepatitis and worrying in another whose liver is quiet. Only a doctor who knows your liver condition, your earlier results and your scans can put the number in context.
Who this does not apply to
If you are pregnant, your AFP is part of a pregnancy screening test and is read in a completely different way. If a child is being tested, ask the paediatric team, and our page on hepatoblastoma in children may help. If a young man has a testicular lump, AFP belongs to his urologist or oncologist, not to a liver page.
When to act quickly
A report alone is rarely an emergency. But if a raised AFP comes with yellow eyes, a swelling abdomen, vomiting blood, black stools or new confusion, do not wait for the next routine visit. Those signs need a doctor the same day, whatever the AFP says.
If you have a report in hand and are unsure what to do next, call the helpline and someone will tell you who should see it.Questions we are asked
Common questions about the AFP test
Is AFP a test for liver cancer?
Not on its own. AFP is a marker that can be raised by liver cancer, but it is also raised by hepatitis and cirrhosis, and many liver cancers do not raise it. It is used alongside an ultrasound or a scan, never as the only test that decides whether cancer is present.
Do I need to fast before an AFP blood test?
Usually not. AFP is not affected by a normal meal. If other tests are being drawn at the same time, such as sugar or cholesterol, those may need fasting, so follow the instructions the laboratory gives you for the whole set of tests.
Why does my hepatitis B doctor check AFP?
Hepatitis B raises the chance of liver cancer, even in some people without cirrhosis. AFP, together with a regular ultrasound, is part of watching for a small cancer early, when more treatment choices are open. It is a routine check, not a sign that the doctor suspects anything.
Can AFP be high because of fatty liver?
Simple fatty liver does not usually raise AFP by much. If fatty liver has progressed to inflammation or cirrhosis, the liver can make more AFP while it repairs itself. Your doctor will read the value against how advanced your liver disease is.
How often should AFP be checked?
That depends on why it is being done. People under surveillance usually have it at the same visit as their regular ultrasound. After treatment the schedule is set by your oncologist. There is no reason for a healthy adult without liver disease to check it routinely.
Can men and women have different AFP levels?
Outside pregnancy, healthy men and women have similarly low levels, and the same reference range is normally used. Pregnancy is the big exception, which is why a pregnant woman's AFP is never read against a liver range.
My AFP came back slightly above the range. What now?
Do not panic and do not ignore it. Show it to the doctor who ordered it, along with your earlier results and scans. Often the plan is a repeat test and an ultrasound. Our page on normal and raised AFP explains how the range is read.
Can CION help me understand my AFP result?
Yes. A CION medical oncologist can review the result with your scans and liver history, explain what it means in your situation, and arrange any further scan through a partner diagnostic centre. One helpline serves every CION centre, so call and describe what you have been given.
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
- MedlinePlus — Alpha Fetoprotein (AFP) Tumor Marker Test
- American Cancer Society — Can Liver Cancer Be Found Early?
- American Cancer Society — Diagnosing Liver Cancer
- Cancer Research UK — Diagnosing liver cancer
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.
Keep reading
Related pages
Normal AFP range and what counts as raisedHow the number on your report is readRaised AFP without cancer: the common reasonsWhy a high value is often not cancerNormal AFP with liver cancerWhy a normal result does not replace the scanUltrasound plus AFP: why bothHow surveillance uses the two together
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Not sure what your AFP result means?
Share the report with us along with any scans you have, and a medical oncologist will explain what it means for you and what, if anything, should happen next. One helpline serves every CION centre.