Understanding Lab Tests for Varicella (Chickenpox)
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Varicella, commonly known as chickenpox, is a highly contagious viral infection caused by the Varicella-Zoster Virus (VZV). While active chickenpox is typically diagnosed by its characteristic rash and symptoms, blood testing plays a crucial role in determining immunity status and confirming past infection.
Recommended Test
Varicella-Zoster Virus (VZV) Antibodies, IgG (Chickenpox)
This test measures IgG antibodies specific to the Varicella-Zoster Virus in the blood. The presence of these antibodies typically indicates a past infection with chickenpox or successful vaccination, suggesting the person has developed immunity against the virus. This test is essential for determining immune status, especially in situations where exposure risk is high or vaccination history is uncertain.
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Why Blood Testing is Important for Varicella
Blood tests for varicella are primarily used to determine if a person has immunity to the virus, either from previous infection or vaccination. This information is particularly valuable for healthcare workers, pregnant women, and individuals who may have been exposed to chickenpox but are unsure of their immune status.
Understanding Your Results
A positive result for VZV IgG antibodies generally indicates immunity to chickenpox. A negative result suggests no immunity, and vaccination may be recommended. It's important to discuss results with your healthcare provider, as they can interpret findings in the context of your medical history and current health status.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
