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Cva9igmtitrserif

Published: August 9, 2026Updated: August 10, 2026

This test detects IgM antibodies against Coxsackievirus A9 in your blood to help diagnose recent infection.

Quick summary

{"Detects IgM antibodies indicating recent Coxsackievirus A9 infection","Helps diagnose viral myocarditis and other Coxsackie virus infections","Sample is collected from a blood draw","Positive result suggests recent or active infection","Results should be interpreted by your healthcare provider"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 10, 2026Editorial policy

Key facts at a glance

LOINC
58791-5
Short code
COXA9IGM
Synonyms
CV A9 IgM Titr Ser IF
Category
cardiac
Sample
serum
Container
Serum separator tube (SST) or plain red top tube
Units
N/A
Ref low
0
Ref high
8
Fasting
false
Population
adult
Sex
all
Age range
0–120 years
Method
Immunofluorescence
CPT
86635
SNOMED
371949004
Specimen volume
1-2 mL of serum
Stability
Refrigerated (2-8°C): up to 7 days; Frozen (-20°C or below): up to 30 days. Avoid repeated freeze-thaw cycles.
Hemolysis max
50
Lipemia max
300
Icterus max
20
TAT
48–96 hours
Order
routine

What is this test?

The Coxsackievirus A9 IgM Antibody Test is a blood test that detects IgM antibodies specifically against Coxsackievirus A9, a type of enterovirus. IgM antibodies are the first antibodies your immune system produces when fighting a new infection, indicating a recent or ongoing infection.

How is the test performed?

A healthcare professional will draw a small sample of blood from a vein in your arm. The sample is then sent to a laboratory where it is tested using immunofluorescence techniques to detect the presence of IgM antibodies against Coxsackievirus A9.

Why might I need this test?

Your doctor may order this test if you have symptoms suggesting a Coxsackievirus infection, particularly symptoms affecting the heart such as myocarditis (inflammation of the heart muscle), pericarditis (inflammation of the heart lining), or when you have symptoms like fever, rash, sore throat, or muscle aches that may be related to Coxsackievirus A9.

Reference range

Negative: <1:8 titer; Equivocal: 1:8 titer; Positive: >1:8 titerN/A

Specimen: serum

No special preparation required. Routine venipuncture precautions apply.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Does a positive result mean I have myocarditis?
No, a positive IgM result indicates you have a recent Coxsackievirus A9 infection, but it does not automatically mean you have myocarditis. Your doctor will interpret the result along with your symptoms, physical examination, and other test results (such as ECG or echocardiogram) to determine if your heart is affected.
How long does it take to get results?
Results are typically available within 3-7 days, depending on the laboratory. Your healthcare provider will contact you with the results once they are ready.
Do I need to fast before this test?
No, fasting is not required for this blood test. You can eat and drink normally before the test.
What does a negative result mean?
A negative result means no IgM antibodies against Coxsackievirus A9 were detected in your blood. This could mean you have not been recently infected with this specific virus, or the infection occurred too early or too late for IgM to be detected. If you still have symptoms, your doctor may recommend repeat testing.
  1. 1
    Coxsackievirus A9 - WikipediaSource
  2. 2
    Enterovirus Infections - CDCSource
  3. 3
    Viral Myocarditis - American Heart AssociationSource

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.

Medical Disclaimer

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