The Anti-Varicella Zoster Virus (VZV) IgG test is a blood test that detects Immunoglobulin G antibodies, confirming if you have immunity (protection) against chickenpox (Varicella) or shingles (Herpes Zoster) from a past infection or vaccination. It’s used to check immunity status, especially for healthcare workers, pregnant women, or before immunosuppressive therapy, showing whether your body has encountered VZV and built lasting defenses. The test requires a simple blood draw, often with no special preparation, and results indicate immunity (positive) or lack of immunity (negative)