Turnaround times
The quoted turnaround time is from sample receipt in the laboratory, to results authorisation in the Laboratory Information Management system. The times do not include transport of specimen to the laboratory or the administrative process to print and post/email reports. Service users must allow for transport and reporting time when ordering tests.
Clinical background:
This is a serological assay used to detect IgG antibodies to Varicella zoster virus (VZV). It is used to provide evidence of PAST VZV infection. IgG antibodies are produced during acute infection or following vaccination and persist life long. It is primarily used to document immunity in healthcare workers and in high risk patients (e.g. pregnant, immunocompromised) who have had significant contact with a case of chickenpox or shingles. It should be noted that a past history of chickenpox is regarded as sufficient evidence of immunity in the immunocompetent, in which case IgG testing is not required.
Specimen container paediatric:
Clotted blood.
Specimen container adult:
Clotted blood – Gold SST.
Minimum volume paediatric:
1 ml.
Minimum volume adult:
5 ml.
Special requirements:
Send to laboratory as quickly as possible. If delays likely, refrigerate at 2-8 deg C.
Sample stability:
Stable for up to 24 hrs.
Transport requirements:
Standard.
Add on test:
Possible up to 5 days.
Quality assurance:
UK National External Quality Assurance Scheme (UKNEQAS).
Interpretation:
A positive IgG indicates previous vaccination or infection with VZV. The results should not be used alone and should be interpreted in the context of clinical presentation.
Reference ranges:
None Available.
Factors affecting result:
If delays likely, refrigerate at 2-8 deg C.
Referenced Documents:
N/A
Other Info:
N/A