Immunology ELISA Assay Kit

ANA Screen ELISA Kit

$415.00

The ANA Screen ELISA Assay Kit is used for the semi-quantitative determination of autoantibodies to nuclear and cytoplasmic antigens in human serum and plasma.  This Eagle Biosciences ANA Screen ELISA Assay Kit is for research use only and not for use in diagnostic procedures.
This product was previously known as ANS31-K01.

SKU: 4010 Categories: , ,

ANA Screen ELISA Kit

ANA Screen ELISA Kit Developed and Manufactured Medipan

Size: 1×96 wells
Incubation Time: 2.5 hours
Sample Type: Serum, Plasma
Sample Size: 10 µL
Alternative Names: Antinuclear Antibody Screen ELISA, Human ANA Screen ELISA
For Research Use Only

Reference Values
Positive: ≥ 1.0
Negative: < 1.0
It is recommended that each laboratory establishes its own normal and pathological reference ranges, as usually done for other diagnostic parameters, too. Therefore, the above mentioned reference values provide a guide only to values which might be expected.
Specificity
Frequency distribution of ANA in ANAscreen: 97 unselected human sera from healthy donors were tested. All sera were found negative. This corresponds to a diagnostic specificity of 100%.

Assay Principle

The ANA screen ELISA Assay Kit is an enzyme immunoassay for the semi-quantitative determination of IgG antibodies to nuclear and cytoplasmic antigens.

Antibodies of the controls and diluted patient samples react with nuclear and cytoplasmic antigens immobilized on the solid phase of microtiter plates. Use of complete HeLa nuclei enriched with recombinant and native antigens guarantees the specific binding of autoimmune antibodies of the specimen under investigation. Following an incubation period of 60 min at room temperature (RT, 18…25°C), unbound sample components are removed by a wash step.

The bound IgG antibodies react specifically with anti-human-IgG conjugated to horseradish peroxidase (HRP). Within the incubation period of 30 min at RT, excessive conjugate is separated from the solid-phase immune complexes by the following wash step.

HRP converts the colorless substrate solution of 3,3’,5,5’-tetramethyl¬benzidine (TMB) added into a blue product. The enzyme reaction is stopped by dispensing an acidic solution into the wells after 15 min at room temperature turning the solution from blue to yellow.

The optical density (OD) of the solution at 450 nm is directly proportional to the amount of specific antibodies bound. Patient ratios are calculated by dividing the respective OD of the specimen with the calculated cut-off OD.

Related Products

ANA Pro (Antinuclear Antibody) ELISA Assay Kit
Anti-Phospholipid Screen ELISA Assay Kit

Additional Information

Assay Background

Systemic autoimmune diseases such as systemic lupus erythematosus, scleroderma, rheumatoid arthritis, Sjögren’s syndrome, dermatomyositis, mixed connective tissue disease are characterized by the appearance of a variety of autoantibodies directed against components of the cell nucleus.
Although significance and pathological relevance of some auto-antibodies are not completely revealed yet, the detection of auto-antibodies is widely established and plays an important role in the diagnosis of systemic autoimmune diseases (1,2,3).  ANAscreen  allows the detection of total autoantibodies to nuclear and cytoplasmic antigens in one sample as a summary parameter in the diagnosis of systemic autoimmune disorders. Antigenic combination of complete HeLa nuclei with recombinant proteins and purified native antigens guarantees a maximum of sensitivy and specificity for the ANA detection.

Assay Procedure

  1. Bring all reagents to room temperature (18-25°C) before use. Mix gently without causing foam.
  2. Dispense 100 µl controls P, CO, N 100 µl diluted patient samples into the respective wells.
  3. Cover plate, incubate 60 min at room temperature (18…25°C).
  4. Decant, then wash each well three times using 300 µl wash solution (made of B).
  5. Add 100 µl of conjugate (D) solution to each well.
  6. Cover plate, incubate 30 min at room temperature (18…25°C).
  7. Decant, then wash each well three times using 300 µl  wash solution (made of B).
  8. Add 100 µl of substrate (E) to each well.
  9. Incubate 15 min protected from light at room temperature (18…25°C).
  10. Add 100 µl of stop solution (F) to each well and mix gently.
  11. Read the OD at 450 nm versus 620 or 690 nm within 30 min after adding the stop solution.

Documents

Publications

Citations

  • Tan EM.: Antibodies to nuclear antigens (ANA) and their immuno¬biology and medicine. Adv Immunol 1982 33:167-240
    von Mühlen CA, Tan EM: Autoantibodies in the diagnostic of systemic rheumatic diseases. Semin Arthritis Rheum 1995 24:323-358
  • Smeenk RJT: Antinuclear antibodies: cause of disease or caused by disease? Rheumatol 2000 39:581-584

Product Citations