Serology
All serology tests require prior approval by
Epidemiology. Testing of serum (or limited
testing of CSF) by enzyme-linked immunoassay
(ELISA) detects IgA, IgM, and IgG antibodies
to determine recent infection. The PHL
performs ELISA only on people who are sick.
Collect blood in a red top or red-gray top
tube at the following times: measles, 3 days
post onset of rash; rubella, 5 days post
onset of rash; SARS, 21 days or more post
onset of symptoms; West Nile and SLE, 8 days
post onset of symptoms. When blood is drawn
before these times, a second draw is
sometimes needed to verify the results. For
SARS testing, other specimens can be
collected at earlier times as specified by
Epidemiology
Microbiology Forms
For further information please refer to the
PHL Directory of Services
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