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HelpEpic Test Code LAB1372 Varicella-Zoster Virus, Molecular Detection, PCR, Varies
Additional Codes
MML:VZVPV
Necessary Information
Specimen source is required.
Specimen Required
Submit only 1 of the following specimens:
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Specimen Type: Body fluid
Sources: Spinal, pleural, peritoneal, ascites, pericardial, amniotic, or ocular
Container/Tube: Sterile container
Specimen Volume: 0.5 mL
Collection Instructions: Do not centrifuge.
Specimen Type: Swab
Sources: Miscellaneous; dermal, eye, nasal, or throat
Supplies:
-Culturette (BBL Culture Swab) (T092)
-M4-RT (T605)
Container/Tube: Multimicrobe media (M4-RT) and ESwabs
Collection Instructions: Place swab back into multimicrobe media (M4-RT, M4, or M5).
Specimen Type: Genital Swab
Sources: Cervix, vagina, urethra, anal/rectal, or other genital sources
Supplies:
-Culturette (BBL Culture Swab) (T092)
-M4-RT (T605)
Container/Tube: Multimicrobe media (M4-RT) (T605) and ESwabs
Collection Instructions: Place swab back into multimicrobe media (M4-RT, M4, or M5).
Specimen Type: Respiratory
Sources: Bronchial washing, bronchoalveolar lavage, nasopharyngeal aspirate or washing, sputum, or tracheal aspirate
Container/Tube: Sterile container
Specimen Volume: 1.5 mL
Specimen Type: Tissue
Sources: Brain, colon, kidney, liver, lung, etc.
Supplies: M4-RT (T605)
Container/Tube:
Preferred: Multimicrobe media (M4-RT)
Acceptable: Sterile container with 1 to 2 mL of sterile saline
Specimen Volume: Entire collection
Collection Instructions: Submit only fresh tissue in a sterile container containing 1 mL to 2 mL of sterile saline or multimicrobe medium (M4-RT, M4, or M5)
ACCEPTABLE SWABS: Swabs in media, such as M4-RT, M4 or M5, Bartels FlexTrans, Jiangsu VTM, BBL CultureSwab, E-Swabs with media –
(dry/flocked E-Swabs are NOT acceptable).
Useful For
Rapid (qualitative) detection of varicella-zoster virus DNA in clinical specimens for laboratory diagnosis of disease due to this virus
This test should not be used to screen asymptomatic patients.
Method Name
Real-Time Polymerase Chain Reaction (PCR)/DNA Probe Hybridization
Reporting Name
Varicella-Zoster Virus, PCR, VariesSpecimen Type
VariesSpecimen Minimum Volume
Ocular Fluid and Spinal Fluid: 0.3 mL
Body Fluid (pleural, peritoneal, ascites, and pericardial): See Specimen Required
Respiratory Specimens: 1 mL
Tissue: 2 × 2 mm biopsy
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Varies | Refrigerated (preferred) | 7 days | |
| Frozen | 7 days |
Reject Due To
| Calcium alginate-tipped swab Wood swab Transport swab containing gel Formalin-fixed and/or paraffin-embedded tissues Heat-inactivated specimen |
Reject |
Clinical Information
Varicella-zoster virus (VZV) causes both varicella (chickenpox) and herpes zoster (shingles). VZV produces a generalized vesicular rash on the dermis (chickenpox) in normal children, usually before 10 years of age. After primary infection with VZV, the virus persists in latent form and may emerge clinically (usually in adults 50 years of age and older) to cause a unilateral vesicular eruption, generally in a dermatomal distribution (shingles).
Reference Values
Negative
Reference values apply to all ages.
Interpretation
Detection of varicella-zoster virus (VZV) DNA in clinical specimens supports the clinical diagnosis of infection due to this virus.
VZV DNA is not detected in cerebrospinal fluid from patients without central nervous system disease caused by this virus.
This LightCycler polymerase chain reaction assay does not yield positive results with other herpesvirus gene targets (herpes simplex virus, cytomegalovirus, Epstein-Barr virus).
Cautions
A negative result does not exclude the possibility of varicella-zoster virus (VZV) infection.
The reference range is typically "negative" for this assay. This assay is only to be used for patients with a clinical history and symptoms consistent with VZV infection and must be interpreted in the context of the clinical picture.
Supportive Data
The following validation data supports the use of this assay for clinical testing.
Accuracy/Diagnostic Sensitivity and Specificity:
LightCycler polymerase chain reaction (PCR) (primers, directed to varicella-zoster virus [VZV], gene 29) was compared with shell vial cell cultures for the detection of VZV from 253 dermal specimens. Twenty-three specimens (9.1%) were positive for VZV by LightCycler PCR and the shell vial cell culture assay. An additional 21 specimens exclusively yielded VZV DNA. These discrepant specimens were resolved as true-positive results by confirmation of results by PCR using primers directed to another gene of VZV. Importantly, there were no instances in which VZV was recovered by the shell vial assay and not detected by LightCycler PCR (specificity, 100%). Of 100 cerebrospinal fluid specimens tested by both conventional PCR and LightCycler PCR, VZV DNA was detected in 49 specimens by both methods; 1 specimen was positive only by the conventional PCR assay. Fifty specimens were found to be negative for VZV DNA by both techniques.
Supplemental Data (Spiking Studies):
To supplement the above data, 30 negative specimens each various specimen type were spiked with VZV plasmid at the limit of detection (10-20 targets/microliter). The spiked specimens were run in a blinded fashion along with approximately 30 negative (non-spiked) specimens each of various specimen types; 90% to 100% of the spiked specimens were positive and 100% of the non-spiked specimens were negative.
Analytical Sensitivity/Limit of Detection:
The limit of detection of this assay is 10 to 20 DNA target copies per microliter in specimen matrix.
Analytical Specificity:
No PCR signal was obtained from extracts of 27 bacterial, viral, and fungal isolates that could be found as normal flora in sites normally tested for this organism or that could cause similar symptoms.
Precision:
Interassay precision was 100%, and intraassay precision was 97%.
Reportable Range:
This test is a qualitative assay, and results are reported as negative or positive for targeted VZV DNA.
Day(s) Performed
Monday through Saturday
Report Available
Same day/1 to 4 daysSpecimen Retention Time
1 weekPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
87798
NY State Approved
YesForms
If not ordering electronically, complete, print, and send a Microbiology Test Request (T244) with the specimen.