Hepatitis A Virus IgM Antibody (Serum/Plasma)
This test detects the presence of IgM antibodies against the hepatitis A virus in your blood. IgM antibodies are produced shortly after infection and can help identify an acute (recent) hepatitis A infection.
["IgM antibodies to hepatitis A virus may indicate recent infection that your body is still fighting."]
Key facts at a glance
- LOINC
- 49522-6
- Short code
- FLUAV H3 Ag Islt Ql IF
- Synonyms
- FLUAV H3 Ag Islt Ql IF
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- if
- 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 Is Done
Your healthcare provider may order this test if you have symptoms of hepatitis A, such as fatigue, nausea, abdominal pain, or jaundice (yellowing of the skin or eyes). It may also be used to diagnose suspected cases of hepatitis A in people who have recently traveled to or lived in areas with higher rates of infection, or in those who have had close contact with someone who has hepatitis A.
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 are on blood thinners or have a history of bleeding disorders, let your provider know before the test.
If IgM antibodies are found in your blood, it suggests you have recently been infected with the hepatitis A virus. If IgM antibodies are absent, it may mean you have not been infected recently or that the infection has resolved. Your provider will discuss the results with you and may recommend further testing or follow-up.
Note: IgM antibodies typically disappear within 3 to 6 months after infection, so repeated testing may be needed to confirm resolution of the infection.
Possible Side Effects
The most common side effect of a blood draw is mild discomfort or bruising at the site where the needle was inserted. Rarely, there may be a slight swelling or redness. If you experience excessive pain, bleeding, or signs of infection (such as increased redness, warmth, or fever), contact your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Hepatitis A is a contagious liver infection caused by the hepatitis A virus. Detecting IgM antibodies helps diagnose acute infection, which is crucial for early treatment and management. Early intervention can help reduce symptoms and prevent complications. This test is particularly important for individuals at higher risk, such as those with liver disease or weakened immune systems.
Short name
IgM Antibody to Hepatitis A Virus
Frequently asked questions
How long does it take to get results from this test?
Can I drink alcohol before this test?
Is there anything I should avoid doing before this blood test?
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