Screen: Indirect immunofluorescence (IFA), HEp-2000 substrate. If positive reflex to multiplex immunobead and anti-ds-DNA (EIA) assays (and tissue ANA where indicated)
Initial Screening test for wide variety of autoimmune diseases including SLE, scleroderma, mixed connective issue disease and others. HEp-2000 cell substrate indirect immunofluorescence pattern and titer will be reported on the positive screens.
A positive screen will reflex to an additional testing cascade which is designed to identify the specificity of antinuclear antibodies observed in the screening assay. See Testing: adult algorithm
A positive screen in a child with concordant clinical findings suggests the possibility of SLE or juvenile rheumatoid arthritis/juvenile chronic arthritis. A positive ANA HEp-2000 IFA screen will reflex to a pediatric specific algorithm. See testing: pediatric algorithm
ANA Screen: Negative, Titer: <1:80. See test specific handbook entries for reflexed testing (ADNA and ENA10) reference ranges.
24 - 48 hours