Rheumatoid Arthritis

 CCP Antibodies  |  Rheumatoid Factor

 

CCP Antibodies

Product

Article No.

No. of tests

EliA CCP 14-5515-01 4x12 tests

Promotion Material

Performance Characteristics
EliA CCP (pdf)

Antigens

From the detailed studies of citrullinated filaggrin peptides by Schellekens et al. in 1998 it became apparent that different RA patients recognise different citrullinated peptides. In cyclic variants of these peptides the citrulline residue is optimally exposed for antibody binding. At the end of 2000, an anti-CCP assay with novel cyclic peptides, which were most reactive with RA sera, and improved performance characteristics was introduced as "second generation CCP (CCP2)" and made commercially available as an ELISA assay.

EliA CCP is based on the CCP2 test.

Antibody specificity and prevalence

Anti-CCP are highly specific for Rheumatoid Arthritis (RA). In an internal study, EliA CCP showed an outstanding sensitivity of 87.8 % and a specificity of 96.9 %.

Several studies show that the CCP test enables clinicians to effectively distinguish RA patients from other RA-resembling diseases, even in cases where the rheumatoid factor is not discriminative. Anti-CCP antibodies can be detected very early in the course of RA.

Information about Rheumatoid Arthritis

Disease activity

The presence of anti-CCP is associated with significantly higher levels of erosions compared to rheumatoid factor and other parameters. Anti-CCP is an independent predictor of radiological damage and progression.

When is the measurement recommended?

Suspicion of Rheumatoid Arthritis.

Antibody isotypes

IgG

References

Schellekens GA, de Jong BA, van den Hoogen FH, et al. (1998)  |  Rantapää-Dahlqvist S, de Jong BA, Berglin E, et al. (2003)  |  Van Gaalen FA, Linn-Rasker SP, van Venrooij WJ, et al. (2004)  |  Forslind K, Ahlmén M, Eberhardt K, et al. (2004)

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Rheumatoid Factor

Products

Article No.

No. of tests

EliA RF IgM

14-5600-01

4x12 tests

EliA RF IgA

14-5601-01

4x12 tests

Promotion Material

EliA RF Detailer (pdf)

Antigen

Rheumatoid factor (RF) is an antibody against the Fc portion of Immunoglobulin G (IgG), which is itself an antibody. RF and IgG join to form immune complexes which contribute to the disease process.

EliA Wells are coated with aggregated rabbit IgG.

Antibody prevalence and prognostic use

In combination with signs and symptoms, RF can play a role in both diagnosis and disease prognosis and, thus, constitutes one of the classification criteria proposed by the American College of Rheumatology (ACR). About 80% of people with rheumatoid arthritis have detectable rheumatoid factor. RF has been recognized as an important predictor of more severe disease. The prevalence of RA is markedly increased in individuals with RF antibodies of more than one isotype, most frequently, a combination of IgM and IgA.

Specificity

However, RF positivity shows low diagnostic specificity because RF are present in patients with other autoimmune and infectious diseases, and even in a noticeable proportion of normal healthy subjects, particularly in ageing individuals. RF can also be detected at high titers in most patients with primary Sjögren's syndrome and may also be elevated in chronic hepatitis, any chronic viral infection, leukemia, dermatomyositis, infectious mononucleosis, systemic sclerosis and systemic lupus erythematosus.

When is the measurement recommended?

Suspicion of Rheumatoid Arthritis and Sjögren's Syndrome.

Antibody isotypes

IgM and IgA

References

De Angelis V, Meroni PL.  |  Nishimura K, Sugiyama D, Kogota,Y et al.  |  Jaskowski TD, Hill HR, Russo KL et al.

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