Cva7abtitrfldcf
This test detects antibodies against Coxsackievirus A7 in body fluids, helping diagnose viral infections that may affect the heart.
{"Coxsackievirus A7 is a virus that can cause heart inflammation (myocarditis)","The test uses complement fixation to detect antibodies your body makes against the virus","Results help doctors determine if a recent or past viral infection is affecting your heart","A positive result indicates past or current infection with this specific virus type","The test is performed on serum (blood) or other body fluids"}
Key facts at a glance
- LOINC
- 31049-0
- Short code
- COXA7
- Synonyms
- CV A7 Ab Titr Fld CF
- Category
- cardiac
- Sample
- serum
- Container
- Serum separator tube (SST) or red top tube
- Units
- N/A
- Ref low
- 0
- Ref high
- 1
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- comp-fix
- CPT
- 86658
- SNOMED
- 122441004
- Specimen volume
- 1-2 mL of serum
- Stability
- Refrigerated (2-8°C) for up to 7 days; frozen (-20°C or lower) for longer storage up to 3 months
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 48–168 hours
- Order
- routine
What is this test?
The Coxsackievirus A7 Antibody test is a laboratory test that detects the presence of antibodies specifically directed against Coxsackievirus A7, a type of enterovirus. The test uses a method called complement fixation, which is a technique that identifies whether your immune system has produced specific antibodies in response to a Coxsackievirus A7 infection. This test is primarily ordered to help diagnose viral infections that may be affecting the heart, particularly myocarditis (inflammation of the heart muscle).
Why might I need this test?
Your doctor may order this test if you have symptoms of a viral infection affecting your heart, such as chest pain, shortness of breath, irregular heartbeat, fatigue, or flu-like symptoms that persist. It is particularly useful when other common causes of heart inflammation have been ruled out. The test helps distinguish between current (recent) and past infections by measuring antibody levels (titers).
How is the test performed?
A healthcare professional will collect a sample of your blood (serum) from a vein in your arm, or occasionally from other body fluids depending on your symptoms. The sample is then sent to a laboratory where technicians use the complement fixation method to detect and measure the levels of Coxsackievirus A7-specific antibodies. This technique involves mixing the patient serum with known viral antigens and complement proteins to see if an immune reaction occurs.
What do the results mean?
A positive result indicates that antibodies to Coxsackievirus A7 were detected in your sample, suggesting you have been infected with this virus at some point. A high titer (concentration) of antibodies typically indicates a recent or current infection. A negative result means no antibodies were detected, which could mean you have not been infected with Coxsackievirus A7, or the infection was in the very early stages before antibodies developed. Your doctor will interpret these results in conjunction with your symptoms and other test findings.
Reference range
Negative: <1:8; Equivocal: 1:8; Positive: >1:8. A four-fold rise in titer between acute and convalescent specimens indicates recent infection.N/A
No special preparation required. Standard venipuncture procedure. Inform laboratory of recent infections or immunizations.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Is this test painful?
Do I need to fast before this test?
How long does it take to get results?
Can this test distinguish between current and past infections?
Is Coxsackievirus A7 the same as hand, foot, and mouth disease?
Sources
- 1
- 2
- 3Enterovirus D68 - CDCSource
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