Coxsackievirus B1 Antibody Test, 2nd Specimen
This blood test measures antibodies against Coxsackievirus B1, a common enterovirus, to help your doctor diagnose viral infections that may be affecting your heart, such as myocarditis or pericarditis. Because this is a 2nd specimen test, comparing antibody levels between two blood samples drawn at different times shows whether your infection is recent, ongoing, or from the past, which helps guide the right follow-up care and treatment decisions for your situation.
{"The test detects immune response to Coxsackievirus B1, a virus that can cause heart inflammation","A second specimen is collected to compare antibody levels over time","Results help doctors diagnose or rule out viral myocarditis or pericarditis","The test requires a simple blood draw","Positive results indicate current or past infection with this virus"}
Key facts at a glance
- LOINC
- 24252-9
- Short code
- CVB1-2
- Synonyms
- CV B1 Ab sp2 Titr Ser
- Category
- cardiac
- Sample
- serum
- Container
- Serum separator tube (SST) or red top tube
- Units
- N/A
- Ref low
- 8
- Ref high
- 16
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- Enzyme Immunoassay (EIA)
- CPT
- 86622
- SNOMED
- 122442004
- Specimen volume
- 1.0 mL minimum, 2.0 mL preferred
- Stability
- Room temperature: 8 hours; Refrigerated (2-8°C): 72 hours; Frozen (-20°C or below): 30 days
- Hemolysis max
- 50
- Lipemia max
- 300
- Icterus max
- 20
- TAT
- 48–168 hours
- Order
- routine
What is this test?
The Coxsackievirus B1 Antibody Test is a blood test that detects whether your immune system has produced specific antibodies against Coxsackievirus B1. This virus is part of a group of viruses called enteroviruses, which commonly cause infections ranging from mild colds to more serious conditions affecting the heart.
What does "2nd specimen" mean?
When your doctor orders a "2nd specimen" test, it means this is a follow-up blood draw taken some time after the first test. By comparing the antibody levels (titers) from both samples, doctors can determine whether your infection is recent, ongoing, or from the past. A rising titer suggests a recent or active infection, while stable or declining levels may indicate a past infection.
Why is this test ordered?
This test is most commonly ordered when a patient has symptoms suggesting heart involvement from a viral infection, such as chest pain, shortness of breath, palpitations, or unexplained fatigue. It helps doctors diagnose conditions like myocarditis (inflammation of the heart muscle) or pericarditis (inflammation of the heart's outer lining) that can be caused by Coxsackievirus B infections.
How is the test performed?
A healthcare professional will draw a small blood sample from a vein in your arm. The sample is then sent to a laboratory where technicians look for specific antibodies (IgM and IgG) that your immune system produces in response to Coxsackievirus B1 infection. No special preparation is needed before the test.
Reference range
Negative: <1:8; Equivocal: 1:8; Positive: ≥1:16N/A
No special preparation required. Patient may eat and drink normally before sample collection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Coxsackievirus B is a common cause of viral myocarditis, a condition where the heart muscle becomes inflamed and may not pump effectively. Identifying a recent Coxsackievirus B1 infection can help explain symptoms like chest pain, abnormal heart rhythms, or heart failure. The second specimen comparison is particularly valuable because it shows whether the infection is actively progressing or resolving, which guides treatment decisions and prognosis.
Positive IgM antibodies typically indicate a recent or current infection, usually within the past few weeks to months. Positive IgG antibodies can indicate either a past infection or immunity from previous exposure. The pattern between first and second specimens helps distinguish between acute, subacute, or past infection, which is crucial for appropriate management of cardiac complications.
Frequently asked questions
Is this test dangerous?
How long does it take to get results?
What do positive results mean?
Can I have this virus without knowing it?
How is a Coxsackievirus heart infection treated?
Sources
- 1
- 2
- 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 10, 2026. · Read our editorial policy