Overview
VZV IgG indicates past varicella infection or vaccination immunity; VZV IgM is inconsistently useful for acute diagnosis.
Clinical Importance
Assess varicella immunity (healthcare workers, pregnancy, pre-immunosuppression)
Selected acute VZV evaluations (PCR from lesions preferred)
Specimen Requirements
- Specimen: serum (preferred for most serology/autoimmune immunoassays) or plasma when the method is validated
- Tube: gold/SST (serum separator) or red-top serum; follow method-specific plasma acceptability
- Handling: allow SST to clot fully; centrifuge and separate promptly; avoid repeated freeze–thaw
- Storage: refrigerate short-term; freeze aliquots for delayed testing per manufacturer stability
- Stability: analyte- and kit-specific; do not exceed validated time/temperature limits
Analytical Method
Immunoassays quantify VZV IgG; glycoprotein ELISA methods correlate better with immunity than some older assays.
Instruments Used
Automated analyzers
- Roche Cobas immunoassay systems
- Abbott Alinity / Architect immunoassay systems
- Siemens Healthineers Atellica / ADVIA Centaur systems
- DiaSorin LIAISON systems
- bioMérieux VIDAS systems
- Ortho Vitros immunoassay systems
Manual methods
- Manual ELISA and rapid immunochromatographic serology tests
Reference Values
Assay cutoffs, units, and reference intervals are method- and manufacturer-specific. Always interpret against the performing laboratory report (CLSI EP28-A3c for quantitative intervals where applicable). Serologic patterns require clinical correlation and current guideline algorithms (WHO/CDC/society guidance as adopted locally).
Immune/nonimmune cutoffs are method-specific IU/mL or index values.
Interpretation
Common Causes of Increased Results
- VZV IgG above cutoff; seropositive/immune by assay criteria
Common Causes of Decreased Results
- Below cutoff; susceptible or equivocal
Clinical Significance
- Immunity screening
- TORCH-related panels when included
Factors Affecting Results
Pre-analytical
- Hemolysis, lipemia, or icterus (assay-dependent interference)
- Wrong tube type or incomplete clotting of SST
- Repeated freeze–thaw of serum aliquots
- Testing too early or too late relative to infection/vaccination timing for serology
Analytical
- Calibration/QC failure; reagent lot shifts
- Hook effect / antigen excess on selected immunoassays
- Heterophile antibodies, rheumatoid factor, or biotin interference (assay-dependent)
Post-analytical
- Applying another laboratory’s cutoff to a different method
- Interpreting a single serology result without clinical timing and confirmatory algorithms
Advantages and Limitations
Advantages
- Practical immunity marker
Limitations
- Lesion PCR preferred for acute zoster/chickenpox diagnosis
- IgM not reliable for zoster
Clinical Pearls
Swab the vesicle for PCR . VZV IgG only tells you who has met the virus before.
References
Authoritative textbooks, guidelines, and reviews supporting this laboratory test reference. Verify reference intervals, critical limits, and method details against institutional protocols and current guideline editions.
Textbooks
- McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods (verify current edition). Chapters on clinical immunology and serology.
- Rifai N, Horvath AR, Wittwer CT, eds. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics (verify current edition). Immunoassay and protein chapters.
CLSI and Professional Guidelines
- Centers for Disease Control and Prevention. Laboratory testing recommendations for infectious disease serology and related algorithms (verify current CDC guidance for the pathogen).
- Clinical and Laboratory Standards Institute. Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory. CLSI document EP28-A3c (verify current edition).
- Clinical and Laboratory Standards Institute. Immunoassay and related method evaluation documents (e.g., EP05, EP06, EP07, EP17; verify current editions relevant to the assay).
- College of American Pathologists. Accreditation and proficiency testing expectations for immunology/serology (verify current CAP checklist requirements).
- International Federation of Clinical Chemistry and Laboratory Medicine (IFCC). Recommendations relevant to protein and immunoassay measurands (verify current IFCC documents).
WHO Publications
- World Health Organization. Laboratory and diagnostic guidance for serologic and immunologic testing (verify current WHO publication for the analyte/assay).
Frequently Asked Questions
Common questions about using this Varicella-Zoster Virus Antibodies laboratory test Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Varicella-Zoster Virus Antibodies laboratory test reference used for?
This Medical Laboratory Library page summarizes the clinical importance of Varicella-Zoster Virus Antibodies. Review the Clinical Importance section for why the test is ordered in laboratory medicine practice.
Where can I find Varicella-Zoster Virus Antibodies specimen requirements?
See the Specimen Requirements section on this page for specimen information related to Varicella-Zoster Virus Antibodies. Confirm collection details against your laboratory protocol.
Where are Varicella-Zoster Virus Antibodies reference values listed?
See the Reference Values section on this Laboratory Library page. Reference ranges can vary by method and population, so verify intervals with your laboratory.
How do I interpret Varicella-Zoster Virus Antibodies results?
Use the Interpretation section for laboratory interpretation framing, including increased and decreased result patterns when provided. Do not treat educational text as a patient-specific diagnosis.
What analytical method is used for Varicella-Zoster Virus Antibodies?
See the Analytical Method section for principle and method notes. Method details may differ by instrument and institutional SOP.
Are related laboratory tests linked from Varicella-Zoster Virus Antibodies?
Yes. The Related Laboratory Tests section lists connected references for continued lookup in the Medical Laboratory Library.
How can I continue learning after reading Varicella-Zoster Virus Antibodies?
Use Continue learning links on this page for related Academy lessons, medical laboratory quizzes, or laboratory case studies when available for this Immunology & Serology topic.
What are the clinical pearls for Varicella-Zoster Virus Antibodies?
See the Clinical Pearls section for concise laboratory practice notes associated with Varicella-Zoster Virus Antibodies. Apply pearls alongside institutional protocols.
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