Coxsackievirus A Antibody Test (CSF)
This test measures antibodies against Coxsackievirus A in your cerebrospinal fluid, the clear liquid surrounding your brain and spinal cord. It helps your doctor diagnose viral infections, such as meningitis or encephalitis, affecting your central nervous system and guide appropriate treatment.
{"The test uses a sample of cerebrospinal fluid (CSF) collected via lumbar puncture","It detects antibodies your body produces in response to Coxsackievirus A infection","Results help doctors diagnose viral meningitis, encephalitis, or other nervous system infections","Positive results indicate the virus has affected the central nervous system","The test uses complement fixation technology to detect immune response"}
Key facts at a glance
- LOINC
- 63434-5
- Short code
- COXA CSF CF
- Synonyms
- CV A Ab Titr CSF CF
- Category
- cardiac
- Sample
- csf
- Container
- Sterile plastic or glass tube (CSF collection tube)
- Units
- N/A
- Ref low
- 4
- Ref high
- 8
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- comp-fix
- CPT
- 86658
- SNOMED
- 371949004
- Specimen volume
- 1-2 mL CSF
- Stability
- Refrigerate at 2-8°C; test within 24-48 hours preferred. Avoid repeated freeze-thaw cycles.
- Hemolysis max
- 200
- TAT
- 48–168 hours
- Order
- routine
What is this test?
The Coxsackievirus A Antibody Test (CSF) is a laboratory test that detects antibodies against Coxsackievirus type A in your cerebrospinal fluid. Cerebrospinal fluid is the clear fluid that surrounds your brain and spinal cord. This test uses a technique called complement fixation to identify whether your immune system has produced specific antibodies in response to a Coxsackievirus A infection affecting your central nervous system.
How is the sample collected?
The sample is collected through a procedure called a lumbar puncture, commonly known as a spinal tap. A healthcare provider inserts a thin needle between the bones (vertebrae) in your lower back to withdraw a small amount of cerebrospinal fluid. The procedure usually takes about 15-30 minutes. You may experience some discomfort or headache afterward, which typically resolves with rest and adequate hydration.
Why might I need this test?
Your doctor may order this test if you have symptoms suggesting a viral infection of the central nervous system, such as fever, headache, stiff neck, sensitivity to light, confusion, or neurological symptoms. Coxsackievirus A can cause viral meningitis, encephalitis, and other neurological complications. This test helps differentiate viral causes from bacterial infections, which is important for determining the appropriate treatment.
What do the results mean?
A positive result indicates that antibodies to Coxsackievirus A were detected in your cerebrospinal fluid, suggesting that the virus has infected your central nervous system. A negative result means no antibodies were detected, though this doesn't completely rule out infection—especially if the test was done early in the illness. Your doctor will interpret these results along with your symptoms, physical examination, and other test findings to make a diagnosis.
Reference range
Negative: <1:4; Equivocal: 1:4 to 1:8; Positive: >1:8 (titer values may vary by laboratory)N/A
No special preparation required. Patient should inform physician of any recent infections or immunizations.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is clinically significant for diagnosing Coxsackievirus A infections of the central nervous system, including viral meningitis and encephalitis. Coxsackievirus A is part of the enterovirus family and commonly causes hand, foot, and mouth disease in children. When the virus spreads to the nervous system, it can lead to serious complications. The complement fixation method specifically detects complement-fixing antibodies, which are part of the immune response. A positive result supports the diagnosis of Coxsackievirus-related neurological infection, helping guide treatment decisions and prognosis. This test is particularly valuable because it directly detects the immune response in the affected compartment (CSF), providing more definitive evidence of CNS involvement than blood tests alone.
Frequently asked questions
Is this test painful?
How long does it take to get results?
Do I need to fast before this test?
What is complement fixation?
Are there any risks after the lumbar puncture?
Sources
- 1
- 2Viral Meningitis - CDCSource
- 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