Cva9abtitrsercf
This blood test checks for antibodies against Coxsackievirus A9, a virus that can sometimes cause heart-related complications.
{"The test uses a blood sample to detect antibodies to Coxsackievirus A9","It helps doctors determine if you've been infected with this virus","Results can help identify causes of heart inflammation or other cardiac symptoms","The test may be repeated several weeks apart to check for rising antibody levels"}
Key facts at a glance
- LOINC
- 9757-6
- Short code
- COXA9T
- Synonyms
- CV A9 Ab Titr Ser CF
- Category
- cardiac
- Sample
- serum
- Container
- Serum separator tube (SST) or plain 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
- 371441004
- Specimen volume
- 1.0 mL serum minimum, 2.0 mL preferred
- Stability
- Room temperature: 8 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 30 days
- Hemolysis max
- 50
- Lipemia max
- 300
- Icterus max
- 20
- TAT
- 72–168 hours
- Order
- routine
What is this test?
The Coxsackievirus A9 antibody test is a blood test that looks for specific antibodies (your immune system's defensive proteins) against Coxsackievirus A9. This virus is part of a group of viruses called enteroviruses, which are common and typically cause mild illnesses like hand, foot, and mouth disease. However, in some cases, these viruses can affect the heart.
How is the test performed?
A healthcare professional will draw a small blood sample from a vein in your arm. This sample is then sent to a laboratory where it is analyzed using a method called complement fixation. This technique detects whether your blood contains antibodies specifically targeting the Coxsackievirus A9.
What do the results mean?
Your test results will indicate whether antibodies are present in your blood. A positive result means you have been infected with Coxsackievirus A9 at some point. If the test is done twice several weeks apart, rising antibody levels (called seroconversion or a four-fold rise in titer) suggest a recent or active infection. Your doctor will interpret these results in combination with your symptoms and other test findings.
Is any preparation needed?
No special preparation is typically required for this test. You can eat and drink normally before having your blood drawn. However, always follow any specific instructions your healthcare provider gives you.
Reference range
Negative: <1:8; Equivocal: 1:8; Positive: >=1:8N/A
No special preparation required. Fasting is not necessary for this test.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Why do I need this test?
Does a positive result mean I have heart disease?
How long does it take to get results?
Do I need to fast before this test?
What is the difference between IgG and IgM antibodies?
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 14, 2026. · Read our editorial policy