Human ANA Hep screen ELISA kit intended for determining in vitro quantitative amounts of IgG autoantibodies to anti-nuclear antigens (antinuclear antibodies, ANA Hep) in human plasma and serum. This screening assay has a minimum analytical sensitivity limit of diagn. 98.9%.
A mixture of purified antigens SS-A-52 (Ro-52), SS-A-60 (Ro-60), SS-B (La), RNP/Sm, RNP-70, RNP-A, RNP-C, Sm-BB, Sm-D, Sm-E, Sm-F, Sm-G, Scl -70, Jo-1, dsDNA, ssDNA, polynucleosomes, mononucleosomes, histone complex, histone H1, histone H2A, histone H2B, histone 3, histone H4, Pm-Scl-100 and centromere B is coated on to microwells.
Antinuclear antibodies (ANA) which are also referred to as antinuclear factor (ANF) are essentially autoantibodies that have the ability to bind to specific contents of the cell nucleus. There are many subtypes of ANAs and each of these can bind a different proteins or protein complexes within the nucleus. Some of the common examples of the different subgroups include anti-Ro, anti-La, anti-Sm, anti-nRNP, anti-Scl-70, anti-dsDNA, anti-histone, anti-centromere and anti-sp100 antibodies. ANAs are found in many disorders such as rheumatoid arthritis, psoriatic arthritis, juvenile idiopathic arthritis, scleroderma, primary biliary cirrhosis, multiple sclerosis, autoimmune hepatitis, dermatomyositis, Sjögren’s syndrome, thyroid disease, drug induced lupus, systemic lupus erythematosus, discoid lupus, idiopathic thrombocytopaenic purpura, cancer and infection. They can also be present in some healthy individuals.
The detection of ANA in blood is usually determined using a screening test. Even though there are a number of different tests possible, the most common ones used for screening are either ELISA or indirect immunofluorescence (IF) methods. If positive result is obtained then more specific tests are performed based the IF-ANA staining patterns and the clinical findings. Antigen specific ELISA assays are available which have the ability to react with single autoantigens for example dsDNA, Scl-70, Sm/RNP, SS-A/Ro etc.
ANA HEP SCREEN ELISA KIT CONTENT
All reagents supplied need to be stored at 2 °C – 8 °C, unopened reagents will retain reactivity until expiration date. Do not use reagents beyond this date.
- Divisible Microplate: Anti-nuclear antibodies (ANA screen) are bound to microwells.
- Control A (Negative), Control B (Cut-Off), Control C (Positive): Consisting of ANA antibodies in a serum/buffer matrix.
- Sample Buffer (5x).
- Enzyme Conjugate.
- TMB Substrate.
- Stop Solution.
- Wash Buffer (50x Concentrated).
- Instruction For Use.
- Certificate Of Analysis.
The minimum detection sensitivity level of human IgG autoantibodies to anti-nuclear antibodies (antinuclear antibodies) using this ANA Hep screen ELISA kit was diagn. 98.9%.The dynamic range for this assay is cut-off index 1.0.
– Anti-Nuclear Antibodies Hep (ANA Hep): ELISA
– Expected Values: In a normal range = Cut-off Index 1.0, Negative = < 1.0, Positive = > 1.2, Border Line = 1.0 – 1.2.
– Linearity: 89 – 107%
– Intra Assay Precision: 6.9 – 10.4%
– Inter Assay Precision: 9.9 – 11.2%
– Clinical Diagnosis: Sensitivity (98.9%), Specificity (98.0%), Overall agreement (98.3%).
- Comparison of three commercially available enzyme immunoassays for the screening of autoantibodies to extractable nuclear antigens. J Clin Lab Anal. (1995) 9 (3): 166-72. Jaskowski T.D., et al.
- Precise quantitation of antinuclear antibodies on HEp-2 cells without the need for serial dilution. Clin Diagn Lab Immunol. (1996) 3 (4): 374-7. Hollingsworth P.N., et al.
- Can an ELISA replace immunofluorescence for the detection of anti-nuclear antibodies?–The routine use of anti-nuclear antibody screening ELISAs. Clin Lab. (2007) 53 (3-4): 183-91. Sinclair D., et al.
- The clinical significance of the dense fine speckled immunofluorescence pattern on HEp-2 cells for the diagnosis of systemic autoimmune diseases. Clin Dev Immunol. (2012) 2012: 494356. Review. Mahler M. and Fritzler M.J.
- Antinuclear antibodies (ANA) screening by enzyme immunoassay with nuclear HEp-2 cell extract and recombinant antigens: analytical and clinical evaluation. Clin Biochem. (2002) 35 (6): 463-9. González C., et al.
- Full Name: ANA Hep Screen ELISA Kit
- Reactivity: Human
- Sample Type: Serum, Plasma
- Sensitivity: 98.9%