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Zika Virus Testing Timeline: Comparing Commercial
Laboratories and the Public Health Laboratory
◊
orders test(s)
┼;
PCR or negative IgM test results received
Samples with presumptive positive, equivocal, or inconclusive
IgM test results are automatically processed by CDPH-VRDL
for confirmation by plaque reduction neutralization testing
(PRNT)
Confirmatory
PRNT results
received
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orders
test(s)
┼
. Specimen
analysis ╪
PCR or
negative IgM
test results
received
Confirmatory
PRNT results
received
Samples with presumptive positive,
equivocal, or inconclusive IgM test
results are automatically processed
by CDPH-VRDL for confirmation by
plaque reduction neutralization
testing (PRNT)
As of 3/2/17 Alameda County Public Health is aware of the following labs using FDA approved testing for both molecular
(R-PCR) and serologic (IgM) Zika testing: ARUP Laboratories, BioReference Laboratories, LabCorp, Mayo Medical
Laboratories, Quest Diagnostics, Viracor Eurofins. Providers who wish to use other facilities should contact them prior to
sending specimens to ensure they meet the requirements outlined in the 3/2/17 Health Advisory.
◊ Patient must be instructed to bring specific paperwork (provided by public health) to specimen collection location if not at
provider’s in-house laboratory
┼ Assumes patient takes approximately 2 days to get specimen drawn; this may take longer if patient delays
╪ Commercial labs reports 2-3 days turn-around-time for PCR and 2-7 days for IgM
* Turn-around-time for the California Department of Public Health laboratory for both PCR and IgM is up to 4 weeks
Turn-around-time for the California Department of Public Health laboratory for PRNT is up to 2 weeks
Continue to use the Public Health Laboratory for the
following situations:
Testing
Complete
Total Time:
3 - 8 weeks
Testing
Complete
Total Time:
1 -3 weeks
Weeks
. Specimen
analysis at
CDPH-VRDL*
. Specimen
analysis at
CDPH-
VRDL
. Specimen
analysis at
CDPH-
VRDL