Understanding Lab Tests for Chickenpox (Varicella)
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Chickenpox (varicella) 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 tests play an important 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 chickenpox infection or successful vaccination. The body produces these protective antibodies as an immune response to the virus, and they remain in the bloodstream to provide long-term immunity against future chickenpox infections.
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Why Blood Testing is Important for Chickenpox
Blood tests for chickenpox are not used to diagnose an active infection, but rather to determine if someone has immunity to the virus. This testing is fundamental for assessing whether a person is protected against future chickenpox infections, which is particularly important for healthcare workers, pregnant women, and individuals with compromised immune systems.
When is VZV Antibody Testing Recommended?
This testing is commonly recommended for adults who cannot recall having chickenpox as children, healthcare workers who need to verify their immunity status, women planning pregnancy, and individuals who may be at higher risk of complications from chickenpox infection.
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.
