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AFP in pregnancy and why it is read differently | CION Cancer Clinics
A raised AFP in pregnancy is usually a sign of the pregnancy, not liver cancer. The baby makes AFP and some of it crosses into the mother's blood, so the level climbs in every normal pregnancy. This page explains why the adult tumour-marker range does not apply, what usually pushes antenatal AFP up, and how your liver is watched if you have hepatitis B or cirrhosis. 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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On this page
- Why is AFP raised in pregnancy?
- What can make AFP higher than expected in pregnancy?
- I have hepatitis B and I am pregnant. How is my liver watched?
- What do the words on an antenatal AFP report mean?
- What do families get wrong about AFP in pregnancy?
- What can this page not tell you?
- Common questions about AFP in pregnancy
The short answer
Why is AFP raised in pregnancy?
AFP rises in every normal pregnancy because the baby makes it. A raised AFP in a pregnant woman is usually a sign of the pregnancy, not a sign of liver cancer, and it has to be read against a completely different scale.
Where the AFP comes from
AFP, short for alpha-fetoprotein, is a protein made by the developing baby's liver and yolk sac. Some of it crosses into the mother's blood. That is why the level climbs as the pregnancy goes on, and why it falls back after delivery. In adults who are not pregnant, the liver makes very little, which is why a high level outside pregnancy prompts a closer look. Our page on what AFP is and what it measures explains the protein itself.
Two tests with the same name
The AFP an obstetrician orders is a screening test for the baby. The AFP an oncologist or hepatologist orders is a tumour marker for the adult. The blood sample is the same. The question being asked, and the normal range used to answer it, are not. A tumour-marker range printed on a laboratory report does not apply to a pregnant woman.
If your report was ordered as part of antenatal care, take it back to your obstetrician first. They know what result to expect for the stage of your pregnancy.The usual reasons
What can make AFP higher than expected in pregnancy?
Most surprises on an antenatal AFP have an ordinary explanation. Liver cancer is a rare one.
The dates are slightly off
AFP is read against how far along the pregnancy is. If the pregnancy is further along than the dates suggested, the level looks high when it is normal for the true stage. A dating scan often settles this.
More than one baby
Twins or triplets each make AFP, so the mother's level is higher. This is expected and is allowed for once the scan shows it.
Something to check in the baby
This is the reason antenatal AFP is measured. A higher level can point towards an opening in the baby's spine or abdominal wall, and a detailed anomaly scan is the usual next step.
This is your obstetrician's area, not a cancer question.A liver problem in the mother
Rarely, active hepatitis, cirrhosis or a liver tumour adds AFP from the mother's own liver. It is suspected when the mother already has liver disease or an ultrasound shows a mass, not from AFP alone.
More likely if
- You are hepatitis B or C positive
- You have known cirrhosis
- A scan has shown a lump in the liver
Not sure whether this applies to you?
Ask an oncologistIf you have liver disease
I have hepatitis B and I am pregnant. How is my liver watched?
Tell both doctors about each other
Your obstetrician and your liver doctor need to know about the pregnancy and the hepatitis. Each will plan differently once they know. Our page on hepatitis B and pregnancy covers protecting the baby.
Expect AFP to be set aside for now
Because the baby's AFP swamps the reading, it cannot be used as a liver cancer marker during pregnancy. Do not be alarmed if the number is high, and do not be falsely reassured either.
Ultrasound carries the surveillance
Ultrasound uses no radiation and is used freely in pregnancy. If you were due a surveillance scan, it usually goes ahead, with the sonographer told you are pregnant.
AFP restarts after delivery
Once the baby's AFP has cleared from your blood, the tumour-marker reading becomes meaningful again. Ask your doctor when the first post-delivery test should be, and keep it with your older results.
On your report
What do the words on an antenatal AFP report mean?
- MSAFP
- Maternal serum AFP. The AFP in the mother's blood, measured as a screening test for the baby.
- MoM
- Multiple of the median. Your result compared with the typical level for women at the same stage of pregnancy. It is how antenatal AFP is judged, rather than by a fixed number.
- Gestational age
- How far along the pregnancy is. Every antenatal AFP result depends on this being right.
- Screen positive
- The result is outside the expected band and needs a follow-up scan or test. It is not a diagnosis of anything.
- Tumour-marker reference range
- The normal range for adults who are not pregnant. It is printed on many reports by default and does not apply during pregnancy.
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Commonly believed
What do families get wrong about AFP in pregnancy?
"The report says my AFP is far above normal, so I must have cancer."
The normal range on the report is usually the adult tumour-marker range. In pregnancy, a level far above it is expected. Your obstetrician reads it against the stage of your pregnancy, not against that range.
"A high antenatal AFP means something is definitely wrong with the baby."
It means a closer look is needed. Wrong dates and twins explain many high results, and a detailed scan often shows a healthy baby. It is a screening result, not a verdict.
"My AFP was normal in pregnancy, so my liver is fine."
During pregnancy the baby's AFP hides what the mother's liver is doing, in either direction. If you have hepatitis B or cirrhosis, the ultrasound is what watches your liver until after delivery.
"Being hepatitis B positive means the baby will have it."
Passing the virus to the baby can usually be prevented with a vaccine and an injection given at birth, and sometimes medicine in late pregnancy. Nobody is to blame for carrying the virus.
Did you know
The same protein that worries a liver doctor in an adult is what powers the baby's screening test. AFP is high in pregnancy because the baby is making it, which is exactly why it cannot tell anyone about the mother's liver until after delivery.
Being straight with you
What can this page not tell you?
It cannot tell you whether your own result is normal for your pregnancy. Only the person who ordered the test, knowing your exact dates and scan findings, can do that. It cannot tell you whether a lump on a scan is cancer either.
When liver cancer is a real question in pregnancy
Liver cancer in pregnancy is rare. It is considered when a woman with hepatitis B or cirrhosis has a mass on her ultrasound, or has new pain, jaundice or weight loss. In that case the decision rests on scans and, when needed, a biopsy, with the obstetric and cancer teams planning together. Our pages on liver cancer in pregnancy and hepatitis B in pregnancy with a liver mass go further.
Who this page does not apply to
If you are not pregnant and have not recently given birth, the adult tumour-marker range does apply, and our page on raised AFP without cancer is the better place to start. Babies and young children have naturally high AFP too, and a child's liver is a separate question for a paediatric team.
If you have liver disease and a confusing AFP result in pregnancy, call the helpline. Someone will help you work out which doctor should read it.Questions we are asked
Common questions about AFP in pregnancy
Is a high AFP in pregnancy a sign of liver cancer?
Almost always, no. The baby makes AFP, so the mother's level rises in every normal pregnancy. Liver cancer is only considered when there is known liver disease or a mass on a scan. Ask your obstetrician to explain the result against the stage of your pregnancy before worrying about cancer.
Why does the report show my AFP as abnormal?
Many laboratories print the adult tumour-marker range next to every AFP result, whoever it is for. That range is for people who are not pregnant. Antenatal results are judged by how they compare with other women at the same stage, often written as a MoM value.
When does AFP go back to normal after delivery?
It falls gradually once the baby is born, as the baby's AFP clears from your blood. How quickly varies between women. If you are on liver surveillance, ask your doctor when to repeat the test so the result can be trusted as a liver reading again.
Can I have liver surveillance while pregnant?
Yes. Ultrasound is safe in pregnancy and usually continues on schedule. AFP is simply not useful as a liver marker until after delivery. Tell the person doing the scan that you are pregnant, and tell your liver doctor about the pregnancy.
Does a high AFP mean my baby has a problem?
Not necessarily. It means the screening result is outside the expected band and needs follow-up. Wrong dates and twins are common explanations. A detailed scan, and sometimes further tests, will clarify it. Your obstetrician will guide you through this.
I am hepatitis B positive. Should I worry about my AFP?
Not during pregnancy, because it cannot be read as a liver marker then. What matters more is your hepatitis B care, your ultrasound if one is due, and the plan to protect the baby at birth. Pick up AFP testing again after delivery.
Can CT or MRI be done if a lump is seen in pregnancy?
Sometimes. MRI without contrast is often preferred, and CT is used only when the benefit is clear. The choice is made by the obstetric and cancer teams together. CION arranges scans through accredited diagnostic partners and the tumour board reviews the result.
Who should I ask about a confusing AFP result?
Start with the doctor who ordered it. If it was ordered for the pregnancy, that is your obstetrician. If you have liver disease, also share it with your liver doctor or oncologist. Call the CION helpline if you are unsure, and someone will point you the right way.
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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.
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Dr. C. Raghavendra Reddy
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MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Sources
- MedlinePlus — Alpha Fetoprotein (AFP) Tumor Marker Test
- National Cancer Institute — Tumor Markers
- American Cancer Society — Diagnosing Liver Cancer
- NHS — Hepatitis B
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.
Talk to us
Pregnant, with liver disease, and unsure what your AFP means?
Tell us what was tested and why, and we will help you work out which doctor should read it and what comes next. One helpline serves every CION centre.