Coxsackievirus A Antibody, Cerebrospinal Fluid (CSF)
This test checks a sample of your cerebrospinal fluid (CSF), the clear liquid that surrounds your brain and spinal cord, for antibodies that your immune system makes against Coxsackievirus A. Doctors use it to help find out whether symptoms such as severe headache, fever, stiff neck, or confusion are caused by a viral infection of the brain or its surrounding membranes, and to tell these viral infections apart from bacterial ones so the right treatment can be chosen.
{"The test uses a sample of cerebrospinal fluid (CSF) collected via lumbar puncture","It helps diagnose Coxsackievirus A infections affecting the brain or nervous system","Positive results indicate the body's immune response to a recent or past Coxsackievirus A infection","The test is often ordered when patients show symptoms of meningitis or encephalitis","Results are interpreted alongside clinical symptoms and other laboratory findings"}
Key facts at a glance
- LOINC
- 109459-8
- Short code
- COXA CSF
- Synonyms
- CV A Ab Msmt CSF
- Category
- cardiac
- Sample
- csf
- Container
- Sterile, dry, leak-proof container (polypropylene or glass)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- Enzyme Immunoassay (EIA) or Polymerase Chain Reaction (PCR)
- CPT
- 86658
- SNOMED
- 122441009
- Specimen volume
- 1-2 mL of CSF
- Stability
- Refrigerated (2-8°C) for up to 72 hours; frozen (-20°C or lower) for longer storage. Avoid repeated freeze-thaw cycles.
- Hemolysis max
- 200
- TAT
- 24–72 hours
- Order
- routine
What is this test?
The Coxsackievirus A Antibody test is a laboratory test that detects specific antibodies (IgM and IgG) against Coxsackievirus A in the cerebrospinal fluid (CSF). Cerebrospinal fluid is the clear liquid that surrounds the brain and spinal cord. The test helps healthcare providers determine if a patient has an active or recent infection with Coxsackievirus A, which is a type of enterovirus that can sometimes cause infections of the central nervous system.
Why is this test performed?
This test is typically ordered when a patient presents with symptoms suggesting a brain or nervous system infection, such as meningitis (inflammation of the membranes surrounding the brain) or encephalitis (inflammation of the brain). Symptoms may include severe headache, fever, stiff neck, sensitivity to light, confusion, or seizures. The test helps distinguish viral infections from bacterial infections, which is crucial for determining appropriate treatment.
How is the sample collected?
The sample for this test is cerebrospinal fluid (CSF), which is collected through a procedure called a lumbar puncture or spinal tap. During this procedure, a healthcare provider inserts a thin needle between the bones (vertebrae) in the lower back to withdraw CSF. The area is numbed with local anesthetic to minimize discomfort. The procedure typically takes about 15-30 minutes, and patients may be asked to lie flat for a short time afterward to reduce the risk of headache.
What do the results mean?
Results are typically reported as positive or negative for Coxsackievirus A antibodies. A positive IgM result usually indicates a recent or current infection, as IgM antibodies are produced early in the immune response. A positive IgG result may indicate either a past infection or immunity from previous exposure. Negative results suggest no current infection with Coxsackievirus A, though false negatives can occur if the test is done too early in the infection before antibodies have developed. Your healthcare provider will interpret these results in the context of your symptoms and other test findings.
Reference range
Negative or Not Detected - No detectable Coxsackievirus A IgG/IgM antibodies in CSFN/A
No special preparation required. Patient should be properly positioned for lumbar puncture. Inform patient of risks associated with lumbar puncture including headache, bleeding, or infection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The Coxsackievirus A antibody test in CSF is primarily used to diagnose viral infections of the central nervous system, particularly viral meningitis and encephalitis. Coxsackievirus A is one of the enteroviruses that can cause these conditions. Identifying the specific cause of meningitis or encephalitis is important because treatment differs significantly between viral and bacterial infections. Bacterial meningitis requires urgent antibiotic treatment, while viral meningitis is typically managed with supportive care. This test helps guide appropriate treatment decisions and may eliminate the need for unnecessary antibiotic use.
Frequently asked questions
Is a lumbar puncture painful?
How long does it take to get results?
What is the difference between IgM and IgG antibodies?
Do I need to prepare for this test?
What happens if the test is positive?
Sources
- 1
- 2Viral Meningitis - CDCSource
- 3Enterovirus D68 - LOINCSource
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