What Is An EBV NA IgG Test?
The EBV VCA IgG test is a blood test used to detect antibodies against the viral capsid antigen (VCA) of the Epstein-Barr virus (EBV). This test helps diagnose current or past EBV infections and determines immunity status. EBV is a common virus associated with infectious mononucleosis and other conditions. The presence of IgG antibodies typically indicates a past infection or ongoing immunity.
How is the Test Performed?
The EBV VCA IgM test is conducted through a blood sample:
Sample Collection
A healthcare professional draws blood from a vein in your arm.
Lab Analysis
The sample is analyzed in a laboratory using enzyme-linked immunosorbent assay (ELISA) or chemiluminescence methods to detect the presence and levels of EBV VCA IgG antibodies.
Result Timing
Results are usually available within 1-2 days.
What are the symptoms that prompt this test?
This test is often part of an EBV panel. Common symptoms that prompt this panel are:
Adults
- Muscle weakness
- Persistent fatigue
- Swollen lymph nodes
- Fever and chills
- Sore throat
- Unexplained weight loss
- Enlarged spleen or liver tenderness
- Joint pain
Children
- Low-grade fever
- Irritability or lethargy
- Difficulty swallowing
- Swollen tonsils with white patches
What are Normal Ranges for This Test?
Positive results indicate a past infection or immunity, while negative results suggest no prior exposure to EBV.
- Negative: Less than 0.9 AU/mL
- Indeterminate: 0.9 to 1.1 AU/mL
- Positive: Greater than 1.1 AU/mL
**The above-given reference value is for general guidelines only and should not be considered as a diagnosis. Your healthcare provider will give you the correct interpretation of the results. **
What Happens if Test Results Show Abnormal Levels?
Abnormal results may indicate:
Positive Result – Suggests a past EBV infection or immunity. No treatment is usually required unless symptoms persist.
Indeterminate Result –Additional tests may be needed to clarify infection status, such as EBV VCA IgM or EBNA IgG tests.
Negative Result –Indicates no prior exposure to EBV, and the individual may be susceptible to future infections.
Your doctor may recommend further evaluations, such as:
- EBV nuclear antigen (EBNA) testing
- Complete blood count (CBC)
