Which tests measure Varicella-Zoster Virus IgG Antibody?

Varicella-Zoster Virus IgG Antibody is measured in 1 test on BiomarkersLabs.com, including Varicella-Zoster Virus Antibody, IgG.

Biomarker Reference · VZV IgG

What does the Varicella-Zoster Virus IgG Antibody test measure?

Q: Why is Varicella-Zoster Virus IgG Antibody measured?

VZV IgG seropositivity confirms prior exposure to the virus — through natural infection or vaccination — and is the standard serological indicator of immunity used in clinical and occupational health practice. Seronegative results identify susceptible individuals who are candidates for vaccination or, following exposure, post-exposure prophylaxis with varicella-zoster immune globulin (VariZIG). In immunocompromised patients, the assay retains diagnostic utility but seronegative results must be interpreted cautiously, as impaired humoral immunity can suppress antibody production below the detection threshold even in individuals with prior exposure. The assay does not differentiate between infection-derived and vaccine-derived immunity.

Q: What is the reference range for Varicella-Zoster Virus IgG Antibody?

The standard reference range for Varicella-Zoster Virus IgG Antibody is Negative: <0.90 index; Equivocal: 0.90–1.09 index; Positive: ≥1.10 index # REVIEWER FLAG: Confirm Access Med Labs reporting format and cut-off values — some platforms report in IU/mL (negative <100 IU/mL, positive ≥100 IU/mL) rather than index value. Verify against Access Med Labs assay documentation before publication.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Varicella-Zoster Virus IgG Antibody (VZV IgG) is a clinical biomarker used in infectious-disease assessment. Varicella-zoster virus is a neurotropic alphaherpesvirus that causes varicella (chickenpox) on primary infection before establishing lifelong latency in dorsal root, trigeminal, and autonomic ganglia. It is measured in 1 laboratory test on BiomarkersLabs.com.

Reference Range: Negative: <0.90 index; Equivocal: 0.90–1.09 index; Positive: ≥1.10 index # REVIEWER FLAG: Confirm Access Med Labs reporting format and cut-off values — some platforms report in IU/mL (negative <100 IU/mL, positive ≥100 IU/mL) rather than index value. Verify against Access Med Labs assay documentation before publication.
Units: Index value, IU/mL
Measured In: 1 test
Category: Infectious Disease

Functional medicine optimalNot applicable — VZV IgG is a binary immunity marker. Seropositivity (positive index value or IU/mL above cut-off) indicates immune status; no functional medicine optimal range applies. # REVIEWER FLAG: Some specialist protocols cite minimum protective titres (e.g., ≥165 mIU/mL by FAMA assay) for immunocompromised patients — confirm whether Access Med Labs assay allows quantitative titer reporting and whether a protective threshold should be documented.

What is Varicella-Zoster Virus IgG Antibody?

Varicella-zoster virus is a neurotropic alphaherpesvirus that causes varicella (chickenpox) on primary infection before establishing lifelong latency in dorsal root, trigeminal, and autonomic ganglia. IgG antibodies to VZV emerge 2–4 weeks after primary infection and persist indefinitely in immunocompetent individuals, conferring protective immunity against reinfection. Vaccine-induced IgG titres develop following the live attenuated varicella vaccine series but are generally lower than those generated by natural infection, with the same serological marker used to assess both sources of immunity. The structural glycoproteins gE, gB, and gI are the principal antigenic targets of the humoral immune response.

Why is Varicella-Zoster Virus IgG Antibody measured?

VZV IgG seropositivity confirms prior exposure to the virus — through natural infection or vaccination — and is the standard serological indicator of immunity used in clinical and occupational health practice. Seronegative results identify susceptible individuals who are candidates for vaccination or, following exposure, post-exposure prophylaxis with varicella-zoster immune globulin (VariZIG). In immunocompromised patients, the assay retains diagnostic utility but seronegative results must be interpreted cautiously, as impaired humoral immunity can suppress antibody production below the detection threshold even in individuals with prior exposure. The assay does not differentiate between infection-derived and vaccine-derived immunity.

Reference ranges

Standard reference: Negative: <0.90 index; Equivocal: 0.90–1.09 index; Positive: ≥1.10 index # REVIEWER FLAG: Confirm Access Med Labs reporting format and cut-off values — some platforms report in IU/mL (negative <100 IU/mL, positive ≥100 IU/mL) rather than index value. Verify against Access Med Labs assay documentation before publication.
Functional medicine optimal: Not applicable — VZV IgG is a binary immunity marker. Seropositivity (positive index value or IU/mL above cut-off) indicates immune status; no functional medicine optimal range applies. # REVIEWER FLAG: Some specialist protocols cite minimum protective titres (e.g., ≥165 mIU/mL by FAMA assay) for immunocompromised patients — confirm whether Access Med Labs assay allows quantitative titer reporting and whether a protective threshold should be documented.
Units: Index value, IU/mL

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure Varicella-Zoster Virus IgG Antibody

1 test on BiomarkersLabs.com include this biomarker.

BML-INF-001Comprehensive

Varicella-Zoster Virus Antibody, IgG

Varicella-Zoster Virus IgG Antibody reference range in this test: Negative: <0.90 index; Equivocal: 0.90–1.09 index; Positive: ≥1.10 index # REVIEWER FLAG: Confirm Access Med Labs reporting format and cut-off values — some platforms report in IU/mL (negative <100 IU/mL, positive ≥100 IU/mL) rather than index value. Verify against Access Med Labs assay documentation before publication.

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