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Vasculitis Profile (RDL)

CPT: 83520(x3); 86038; 86160(x2); 86225; 86255; 86431

Expected Turnaround Time

10 days


Related Documents


Specimen Requirements


Specimen

Serum


Volume

4 mL


Minimum Volume

1.5 mL (Note: This volume does not allow for repeat testing.)


Container

Red-top tube or gel-barrier tube


Collection

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.


Storage Instructions

Refrigerate or freeze.


Stability Requirements

Temperature

Period

Room temperature

7 days

Refrigerated

14 days

Frozen

60 days

Freeze/thaw cycles

Stable x1


Causes for Rejection

Grossly hemolyzed; bacterial contamination; lipemic specimen; icteric specimen; non-serum specimen types


Test Details


Use

ANA are commonly found in a variety of autoimmune diseases. Antibody frequency increases with age in apparently healthy people. ANA patterns on HEp-2 slides provide only general clues about particles (chromatin, nucleosomes, and spliceosomes).

The Farr assay is the most specific method of detecting dsDNA autoantibodies. Significant elevations in dsDNA autoantibody concentrations confirm the diagnosis of systemic lupus erythematosus (SLE). Serial studies of elevated values of dsDNA auto antibodies are useful for predicting activity of SLE.

Anti-MPO autoantibodies aid in assessment of certain autoimmune vasculitides such as microscopic polyarteritis, and crescentic glomerulonephritis. PR-3 is the major target antigen of antineutrophil cytoplasmic autoantibodies (ANCA) that give a cytoplasmic (C-ANCA) autoantibodies (ANCA) which give a perinuclear (pANCA) immunofluorescence pattern.

Anti-PR-3 autoantibodies aid in the assessment of certain autoimmune vasculitides such as microscopic polyartheritis and crescentic glomerulonephritis. PR-3 is the major target antigen of antineutrophil cytoplasmic autoantibodies (ANCA) that give a cytoplasmic (C-ANCA) immunofluorescence pattern. Elevated levels of Anti-PR-3 are classically observed in patients with Wegener granulomatosis (WG), particularly with active disease, and less frequently in other forms of necrotizing vasculitis.

ANTI-GBM autoantibodies are recognized as being important in the pathogenesis of the rapidly progressive glomerulonephritis of Goodpasture's syndrome. Measurements of C3 and C4 are used to detect individuals with inborn deficiency of this factor or those with immunologic disease in whom complement is consumed at an increased rate. These include lupus erythematosus, chronic active hepatitis, certain chronic infections, poststreptococcal and membranoproliferative glomerulonephritis, and others.


Limitations

This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.


Methodology

See individual test components.


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