Fluorescent immunoassay for anti-HAV antibodies (IgM)
This test detects IgM antibodies against hepatitis A virus, which appear shortly after infection begins and help identify recent hepatitis A exposure.
["Recent hepatitis A infection may be suspected if this test is positive."]
Key facts at a glance
- LOINC
- 49532-5
- Short code
- FLUAV HA RNA Islt Seq
- Synonyms
- FLUAV HA RNA Islt Seq
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- sequencing
- 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
What Does This Test Measure?
The test measures IgM antibodies specific to hepatitis A virus (HAV). IgM antibodies are produced early in the infection process and can indicate an active or recent hepatitis A virus infection. This test is not used to diagnose chronic hepatitis A, as IgM levels typically decline after acute infection.
Why Might You Need This Test?
Your healthcare provider may order this test if you have symptoms of hepatitis A, such as fatigue, nausea, abdominal pain, or jaundice, or if you’ve been exposed to hepatitis A virus recently. It may also be used to confirm a suspected case of hepatitis A in outbreaks or after travel to regions with higher infection rates.
What to Expect Before the Test
No special preparation is needed for this test. You may have a blood sample drawn from a vein in your arm, similar to other blood tests. If you’re concerned about needles, let your healthcare provider know so they can provide additional comfort measures.
What to Expect After the Test
After the blood is drawn, you may feel a slight pinch or bruising at the site. Apply gentle pressure to stop any bleeding. You can resume normal activities immediately. If you experience excessive bruising or pain, contact your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
IgM Anti-Hepatitis A Virus (HAV) Antibody
Frequently asked questions
A positive IgM anti-HAV test result suggests recent hepatitis A infection and may require further evaluation or treatment recommendations, such as vaccination or antiviral support if needed. A negative result does not definitively rule out infection if symptoms are present, so follow-up testing may be advised.
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Your healthcare provider will discuss the results with you during your follow-up visit.
A negative IgM test does not always mean you are not infected. If you have symptoms of hepatitis A, your provider may recommend additional testing or retesting. Hepatitis A can be prevented through vaccination or by practicing good hygiene.
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