Fluorescent Immunoassay for Antibodies to Hepatitis A Virus Nucleocapsid Protein
This test detects antibodies in your blood that your immune system produces in response to the hepatitis A virus. It helps determine if you’ve been exposed to the virus or if your body has already built immunity.
["This test can help confirm past or recent hepatitis A infection and assess immunity status."]
Key facts at a glance
- LOINC
- 6639-9
- Short code
- FLUAV Bang Ab Ser HAI-aCnc
- Synonyms
- FLUAV Bang Ab Ser HAI-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- hai
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms of hepatitis A, such as fever, fatigue, nausea, or jaundice, or if you’ve been exposed to someone with hepatitis A. It may also be used to check if you’re immune after vaccination or to monitor chronic liver health.
What to Expect Before the Test
No special preparation is needed. A blood sample will be taken from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. If you’re on blood thinners or have a history of bleeding issues, let your provider know.
What the Test Results Mean
Positive results indicate recent or past infection with the hepatitis A virus, meaning your body has detected and responded to the virus. Negative results suggest no current infection or immunity. High antibody levels may mean you’ve recovered from hepatitis A or were vaccinated.
Common Symptoms of Hepatitis A
Hepatitis A often causes flu-like symptoms, including fatigue, abdominal pain, loss of appetite, and dark urine. Some people may also experience joint pain or a skin rash. These symptoms usually appear 2 to 3 weeks after infection and can last for weeks or months.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is critical for diagnosing hepatitis A, which can cause liver inflammation and damage. Early detection allows for prompt treatment and management to ease symptoms and prevent complications. It’s also important for public health to identify outbreaks and prevent further spread.
Short name
Hepatitis A Antibody (Nucleocapsid) Fluorescence Test
Frequently asked questions
How long does it take to get results from this test?
Can I get hepatitis A if I have positive antibodies?
Is this test different from the hepatitis A vaccine?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy