AFP (Alpha-Fetoprotein)
Alpha-fetoprotein (AFP) is a tumor marker used primarily to screen for liver cancer and monitor certain germ cell tumors of the ovaries and testicles.
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What this test measures
Alpha-fetoprotein (AFP) is a protein naturally produced by the developing liver and digestive system of a growing fetus. During normal fetal development, AFP levels are high, but they decline rapidly after birth and remain very low throughout adult life. After birth, AFP levels drop very low. Healthy children and adults who aren't pregnant have very little AFP in their blood.
Tumor markers are substances that are often made by cancer cells or by normal cells in response to cancer. High levels of AFP can be a sign of cancer of the liver, ovaries or testicles. When measured as a tumor marker in non-pregnant adults, elevated AFP levels may indicate the presence of hepatocellular carcinoma (primary liver cancer), non-seminomatous germ cell tumors of the testicles, or certain ovarian cancers. However, AFP can also be elevated in non-cancerous conditions such as chronic hepatitis, cirrhosis, and liver injury, which is why this test is typically used alongside other diagnostic tools rather than as a standalone screening method.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals with chronic liver disease, hepatitis B or C, or cirrhosis who may be at increased risk for developing liver cancer
- Those with a family history of liver cancer or known risk factors such as excessive alcohol consumption or exposure to certain toxins
- Men who have discovered a testicular mass or have symptoms potentially related to testicular cancer
- Women with ovarian masses or symptoms suggestive of ovarian cancer, particularly certain germ cell tumors
- Patients currently undergoing treatment for cancers known to produce AFP who need monitoring of treatment effectiveness
- Those who have completed treatment for AFP-producing cancers and require surveillance for potential recurrence
What to expect
Preparation
No special preparation is needed for this blood test. Patients can eat and drink normally before the test and do not need to adjust medications unless specifically instructed by their healthcare provider.
Sample Type
A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial.
Collection
The blood draw typically takes less than five minutes. Patients may experience a brief sting when the needle is inserted, and there may be slight bruising or soreness at the puncture site afterward.
Turnaround
Results are typically available within 1-3 business days after the laboratory receives the sample.
Understanding your results
AFP levels are measured in nanograms per milliliter (ng/mL) of blood. The interpretation of results depends on several factors including age, sex, pregnancy status, and underlying health conditions. An AFP tumor marker test cannot be used by itself to screen for or diagnose cancer. So, an AFP tumor marker test can't rule out cancer for sure. But when used with other tests and exams, AFP tumor marker testing can help diagnose and monitor cancers that cause high AFP levels.
Elevated AFP levels may suggest the presence of certain cancers, but they can also occur in non-cancerous liver conditions. Normal levels don't completely rule out cancer, as some tumors may not produce elevated AFP. Healthcare providers consider AFP results alongside imaging studies, physical examinations, and other laboratory tests to make accurate diagnoses.
| Population | Reference Range | Notes |
|---|---|---|
| Adult Males | <8-15 ng/mL | AFP levels in men and non-pregnant women vary by age and race but typically range from 0 to 40 ng/mL. Most laboratories use <15 ng/mL as the upper limit of normal for men. |
| Adult Females (Non-pregnant) | <8-15 ng/mL | Similar to males, with normal levels typically under 15 ng/mL. Reference intervals were: AFP, 1.31, 7.89 ng/ml (males) and 1.01, 7.10 ng/ml (females) in some population studies. |
| Pregnant Women | 10-150 ng/mL (15-20 weeks) | Maternal AFP levels increase during pregnancy from about the 14th week of gestation until about 32 weeks. Between 15 and 20 weeks, AFP levels typically range between 10 and 150 ng/mL. |
Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.
What does a “Low” result mean?
AFP levels below the reference range are generally considered normal and reassuring. Low or normal AFP levels suggest that AFP-producing cancers are less likely to be present. However, it's important to understand that normal AFP levels do not completely rule out cancer. And some people who do have liver, ovarian, or testicular cancer will have normal AFP levels. In fact, some HCCs are AFP-negative, implying that these tumours do not synthesise AFP, making them difficult to characterise and diagnose. This is why healthcare providers often use AFP in combination with other diagnostic tools such as imaging studies and additional tumor markers to provide a comprehensive assessment of cancer risk.
What does a “High” result mean?
Elevated AFP levels may suggest several conditions, though further testing is typically needed for definitive diagnosis. In nonpregnant adults, high blood levels (over 500 nanograms/milliliter [or ng/ml]) of AFP are seen in only a few situations, such as hepatocellular carcinoma (HCC), primary cancer of the liver; germ cell tumors (a type of cancer of the testes and ovaries, such as embryonal carcinoma and yolk sac tumors). When you have liver disease already, an AFP of more than 200 ng/mL usually means you have liver cancer. Moderately elevated levels may also be associated with non-cancerous liver conditions such as chronic hepatitis, cirrhosis, or liver damage from other causes. Increased AFP level could also signify severity of hepatic destruction and subsequent regeneration and is commonly observed in patients with acute and chronic liver conditions and cirrhosis. The degree of elevation can help guide further evaluation, with very high levels (>500 ng/mL) being more concerning for malignancy than modest elevations.
Privacy & confidentiality
All test orders are authorized and results reviewed by an independent, board-certified physician who is not the patient's personal doctor. Your AFP test results are completely confidential and protected by strict privacy laws. Unlike routine medical care, these lab results are <u>not sent to your personal doctor</u> unless you specifically request it, and they are <u>not added to your medical records</u> automatically. Your test results will <u>not appear on insurance statements</u> or explanation of benefits (EOB) forms, ensuring your privacy is maintained. The results are securely delivered directly to you through our patient portal, and you have complete control over who has access to this information. No doctor visit is required to order this test, giving you the freedom to monitor your health privately and take charge of your wellness journey. Your employer, insurance company, and other healthcare providers will not be notified of your testing unless you choose to share the results with them.
Frequently asked questions
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This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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