The EULISA ANA Screen 6 IgG is an appropriate first line screen for total anti-nuclear antibody (ANA) in human serum.
A positive ANA test result provides presumptive evidence for systemic rheumatic disease; further definition of specific antibody profiles is a valuable aid in the diagnostic process.
Intended use
Enzyme immunoassay for the detection of autoantibodies IgG against RNP, Sm, Ro (SS-A), La (SS-B), Scl-70 and Jo-1.
Background
Circulating autoantibodies against various intracellular antigens (antinuclear antibodies, ANA) are characteristic for systemic, autoimmune-mediated rheumatic diseases of the connective tissue. These comprise Systemic Lupus Erythematosus (SLE), Mixed Connective Tissue Disease (MCTD), Sj?gren's Syndrome (SS) A and B, Progressive Systemic Sclerosis (PSS, Scleroderma) and Polymyositis (PM).
The diagnosis of the above disorders is often difficult, due to overlapping symptoms, and therefore usually supported by measuring their associated auto-antibodies.
In the EULISA ANA Screen 6 IgG, six antigens specifically recognised by these antibodies are immobilised on the solid phase (Reference: Instructions for use):
|
Antigen |
Source |
Disease |
Autoantibody prevalence
|
|
RNP (proteins A, C, 68kDa)
|
Recombinant
|
MCTD
|
95 %
|
|
|
|
SLE |
30 - 40 % |
|
|
|
PM |
14 % |
|
|
|
SS |
4 % |
|
Sm (proteins B, B', D) |
Bovine thymus |
SLE |
12 - 39 % |
|
|
|
MCTD |
7 % |
|
SS-A/Ro (60kDa-protein) |
Bovine thymus |
SS |
60 - 100 % |
|
|
|
SLE |
45 - 50 % |
|
|
|
MCTD |
15 - 30 % |
|
|
|
PSS |
5 - 7 % |
|
|
|
PM |
5 - 7 % |
|
SS-B/La |
Recombinant |
SS |
30 - 90 % |
|
|
|
SLE |
15 - 30 % |
|
|
|
MCTD |
5 - 15 % |
|
Scl-70 (DNA-topoisomerase 1) |
Recombinant |
PSS |
20 - 76 % |
|
Jo-1 (Histidyl-tRNA-synthetase) |
Recombinant |
PM |
20 - 40 % |
Technical information
The test is designed for the qualitative determination of the combined autoantibodies (IgG) reactivity in human serum, without distinction between different specificities. It is intended as an initial screen test for an overall diagnosis of the above disorders. The test is fast (incubation time 30 / 30 / 30 minutes) and flexible (break apart wells, ready-to-use reagents). A negative and a positive control are used to check assay performance.
