AFP (Alpha-Fetoprotein) Test
Category
Oncology
Specimen
Blood (Serum)
Organ System
Liver
Available At
0 labs
About AFP (Alpha-Fetoprotein) Test
AFP, or Alpha-Fetoprotein, is a protein normally produced in large amounts by a developing fetus's liver and yolk sac, but present at only very low levels in the blood of healthy adults.
In adults, elevated AFP levels can be an important marker for certain cancers, most notably hepatocellular carcinoma (the most common type of primary liver cancer) and certain germ cell tumors of the testicles or ovaries.
The test serves two quite different clinical purposes depending on context: in adults, it helps screen high-risk patients (such as those with cirrhosis) for liver cancer and monitor known cancers, while during pregnancy, AFP is measured as part of a maternal screening panel for certain chromosomal or neural tube conditions in the developing baby — with completely different reference ranges applying in each context.
Because of these very different applications, it's important that AFP results always be interpreted with full knowledge of whether the patient is pregnant, has liver disease, or is being monitored for a known tumor.
When Should You Get AFP (Alpha-Fetoprotein) Test
AFP testing is used for:
- Monitoring patients with cirrhosis or chronic liver disease for early liver cancer detection
- Tracking known liver cancer through and after treatment
- Investigating suspected testicular or ovarian germ cell tumors
- As part of a maternal screening panel during pregnancy (with different reference ranges)
Conditions AFP (Alpha-Fetoprotein) Test Can Detect
Elevated AFP in adults can indicate:
- Hepatocellular carcinoma (primary liver cancer)
- Germ cell tumors of the testicles or ovaries
- Chronic liver disease and cirrhosis, causing milder elevation
How to Prepare for AFP (Alpha-Fetoprotein) Test
- No fasting is required for this test.
- A standard venous blood sample is sufficient.
- Inform your doctor if you're pregnant, since AFP is interpreted completely differently — and used for a different purpose — during pregnancy.
AFP (Alpha-Fetoprotein) Test Normal Reference Ranges
| Parameter | Normal Range |
|---|---|
| Adults (non-pregnant) | Below 10 ng/mL |
In patients with chronic liver disease, AFP is often monitored at regular intervals, since a significant rise can be an early warning sign of developing liver cancer, sometimes appearing before it's visible on imaging.
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Frequently Asked Questions About AFP (Alpha-Fetoprotein) Test
Is AFP used differently during pregnancy?
Yes — during pregnancy, AFP is part of a screening panel assessing risk for certain fetal conditions, with very different expected ranges than in non-pregnant adults, so results must always be interpreted in the correct clinical context.
Can AFP be elevated without cancer?
Yes, chronic liver disease and cirrhosis can cause mild AFP elevation even without cancer being present, so your doctor considers your overall liver health when interpreting results.
How is AFP used in liver cancer monitoring?
Patients with cirrhosis or chronic hepatitis are often monitored periodically with AFP alongside liver imaging, since catching a rising trend early can allow for earlier, more effective cancer treatment.
Medical Disclaimer: This page is for informational purposes only and does not constitute medical advice. Lab test results should always be interpreted by a qualified healthcare professional in the context of your clinical history. Do not self-diagnose or alter your treatment based on test results alone.
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