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Anti-Ro (SS-A); Anti-La (SS-B); Anti-Fodrin Abs, IgG and IgA
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
0.5 mL (Note: This volume does not allow for repeat testing.)
Red-top tube or gel-barrier tube
Separate serum from cells within one hour of collection. Transfer to a plastic transport tube before shipping. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
Refrigerate or freeze.
Grossly hemolyzed; bacterial contamination; lipemic specimen; icteric specimen; non-serum specimen types
Anti-Ro (SS-A) antibodies occur in 40-50% of SLE, 60-75% of primary Sjogren's syndrome (PSS) and in a high proportion of secondary SS whether the associated disease is in SLE, RA, PSS, polydermato-myositis, or primary biliary cirrhosis, but is >90% of subacute cutaneous lupus and in vasculitis-associated SS.
Autoantibodies to SS-B/La antigen are detected by EIA in 70-90% of primary and about 50% of secondary Sjogren syndrome (SS) and as well as in 30% of SLE and 80% of subacute cutaneous lupus and a majority of infants with complete heart block.
Antibodies directed against alpha-fordin can be useful in diagnosing early stage Sjorgen's syndrome.
This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.
Enzyme-linked immunosorbent assay (ELISA)
• Negative: <20
• Weak Positive: 20–39
• Moderate Positive: 40–80
• Positive: >80
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