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Coxsackie Virus B3 Antibody Test

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

This is a blood test that measures the level of antibodies against Coxsackie virus type B3 in your serum, helping to diagnose heart infections such as viral myocarditis. It can help your doctor find out whether a recent viral illness has affected your heart.

Quick summary

{柯萨奇病毒B3型是引起心肌炎的常见病原体,通过检测抗体滴度变化可确认近期感染,第二份标本用于比较抗体水平动态变化,结果需结合临床症状和其他检查综合判断,采样仅需抽取静脉血}

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

Key facts at a glance

LOINC
24260-2
Short code
COXB3T2
Synonyms
CV B3 Ab sp2 Titr Ser
Category
cardiac
Sample
serum
Container
Serum separator tube (SST) or plain red top tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
0–120 years
Method
Enzyme Immunoassay (EIA)
CPT
86658
SNOMED
186639004
Specimen volume
1-2 mL of serum
Stability
Room temperature: 24 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 30 days
Hemolysis max
50
Lipemia max
40
Icterus max
20
TAT
48–168 hours
Order
routine

What is the Coxsackie virus B3 antibody test?

The Coxsackie virus B3 antibody test is a laboratory blood test that measures the level of specific antibodies in your serum against Coxsackie virus type B3. It usually requires two blood samples, one taken during the acute phase of illness and one taken during the recovery phase. By comparing the change in antibody titers between the two samples, doctors can determine whether you have had a recent infection. Coxsackie viruses belong to the enterovirus group and are among the common causes of viral myocarditis, pericarditis, and meningitis.

Why do I need to have this test?

This test is mainly used to help diagnose heart infections caused by Coxsackie virus B3, especially viral myocarditis. Your doctor may order it if you have symptoms such as chest pain, palpitations, shortness of breath, or fatigue and a viral cause is suspected. It may also help identify the underlying cause when there is unexplained abnormal heart function.

How are the test results interpreted?

Results are usually reported as antibody titers. If the titer of the second sample, taken during the recovery phase, is 4 times or more higher than the titer of the first sample, taken during the acute phase, this suggests a recent Coxsackie virus infection. A single test showing high levels of IgM antibodies may also indicate a current infection, while a positive IgG result may indicate a past infection or immunity. Your doctor will interpret your specific results together with your clinical picture and other tests.

How should I prepare for this test?

This test usually requires two blood samples, collected 2-4 weeks apart. No special preparation is generally needed, and you may eat and drink normally before the blood draw. The procedure is similar to a routine blood test and is performed by trained medical staff. If you feel faint when having blood drawn or have difficult veins, please tell the staff in advance.

Reference range

A four-fold rise in titer between acute and convalescent specimens indicates recent infection. Single specimen titer ≥1:160 suggests past or recent infection.N/A

Specimen: serum

No special preparation required. This is the second specimen collected 2-4 weeks after the initial specimen to detect seroconversion or rising antibody titers.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

柯萨奇病毒B3型是导致病毒性心肌炎最常见的病原体之一，心肌炎可引起心脏肌肉炎症，影响心脏泵血功能，严重时可导致心力衰竭或心律失常。通过抗体滴度检测确诊病毒感染后，医生可制定相应的治疗方案，如休息、抗病毒治疗（必要时）及对症支持治疗。早期诊断有助于改善预后，减少并发症发生。

Frequently asked questions

Why are two blood samples collected?
Two samples, one from the acute phase and one from the recovery phase, are collected so that changes in your antibody levels can be observed over time. If the antibody titer shows a 4-fold or greater increase between the two tests, it suggests a recent active infection, which is one of the gold standards for diagnosing viral infections. A single test only reflects your current antibody level and cannot confirm when the infection occurred.
Does a positive result mean I definitely have myocarditis?
Not necessarily. A positive antibody result only means that you have been infected with Coxsackie virus B3 at some point. Whether you have myocarditis must be evaluated together with your symptoms, such as chest pain, shortness of breath, or palpitations, along with an electrocardiogram, an echocardiogram, cardiac enzyme tests, and other examinations. Some infected people have only mild cold-like symptoms or no symptoms at all.
How long does it take to get the test results?
Coxsackie virus antibody testing requires special reagents and equipment, so the testing process takes a relatively long time. In general, it may take 3-7 business days from the time your blood is drawn until the results are available, depending on the schedule of the testing laboratory.
How soon after infection can antibodies be detected?
After a Coxsackie virus infection, IgM antibodies usually appear about 1 week after infection, and IgG antibodies appear 2-3 weeks after infection. For this reason, the acute-phase sample should be collected as soon as possible after symptoms appear, and the recovery-phase sample should be collected 2-4 weeks later to achieve the best diagnostic accuracy.
Can I become infected again after having had this infection?
Coxsackie viruses have many different serotypes. After infection with one serotype, you may develop immunity to that same type, but you can still be infected by other serotypes or variants. For this reason, even if you have been infected before, you should continue to practice good personal hygiene and avoid contact with items that may be contaminated with the virus.
  1. 1
    Mayo Clinic - MyocarditisSource
  2. 2
    CDC - EnterovirusesSource
  3. 3
    American Heart Association - Viral MyocarditisSource

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