Skip to content

Varicella-Zoster Virus Clade-Specific Nucleic Acid Detection

Published: August 9, 2026Updated: August 16, 2026

This test detects and identifies the specific clade (genetic variant) of varicella-zoster virus in a clinical sample. It helps characterize the strain of VZV present rather than simply confirming infection.

Quick summary

["VZV clade testing identifies the specific genetic variant of varicella-zoster virus, useful for surveillance and outbreak investigation."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
86509-7
Short code
VZV clade Spec
Synonyms
VZV clade Spec
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What the Test Detects

The test looks for varicella-zoster virus (VZV), the virus that causes chickenpox and shingles, and distinguishes which genetic clade (lineage) of the virus is present. Clades are distinct genetic groupings of the virus that evolve in different parts of the world.

Why Clade Identification Matters

Knowing the viral clade can help public health investigators track how strains spread, study geographic patterns, and monitor whether vaccination or antiviral resistance patterns differ between clades. It is primarily a specialized or reference-laboratory tool.

How the Sample Is Collected

A sample is taken from a lesion, such as fluid from a vesicle, or occasionally from other body sites as directed by the ordering provider. In the laboratory, the viral genetic material is amplified and analyzed for clade-specific markers.

What the Results Mean

A result identifies the clade (or clades) of VZV detected in the sample. Because this is an investigational and surveillance-oriented test, results are usually interpreted in consultation with the ordering provider or public health team.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

VZV Clade Testing

Frequently asked questions

Is this test used to diagnose chickenpox or shingles?
Not primarily. Standard VZV tests diagnose infection; clade testing is a specialized supplement that characterizes the strain, usually for public health or research purposes.
Does knowing the clade change my treatment?
In most cases, no. Treatment for chickenpox or shingles is based on your symptoms, risk factors, and timing of illness, not on the viral clade.
How accurate is VZV clade testing?
It is a specialized laboratory method with good ability to distinguish clades when adequate viral material is present, but results can be affected by sample quality, timing, and the specific assay used.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy