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Related Experiment Videos

[Recent problems in laboratory tests for rheumatoid factor]

S Yoshinoya1

  • 1Department of Laboratory Medicine, Faculty of Medicine, University of Tokyo.

Rinsho Byori. the Japanese Journal of Clinical Pathology
|August 1, 1993
PubMed
Summary

Rheumatoid factor (RF) testing requires a new standard due to evolving rheumatologic therapies. A newly established murine monoclonal RF (mRF) is proposed as a national standard to improve consistency in RF titer measurements across laboratories.

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Area of Science:

  • Immunology
  • Rheumatology
  • Clinical Chemistry

Context:

  • Rheumatoid factor (RF) detection methods have evolved with advancements in rheumatologic therapies.
  • Quantitative RF analysis using latex agglutination or turbidity immunoassay (TIA) is increasingly used, particularly in Japan.
  • Current RF standards, including WHO standards, lead to inconsistencies in quantitative measurements across different laboratories.

Purpose:

  • To address the inconsistencies in rheumatoid factor (RF) titer measurements obtained from various laboratories using quantitative analysis.
  • To establish a reliable and consistent national standard for RF testing.
  • To propose a murine monoclonal rheumatoid factor (mRF) as a superior alternative to existing standards for accurate RF quantification.

Summary:

  • A murine monoclonal rheumatoid factor (mRF) has been developed and proposed as a national standard for RF testing.
  • This mRF aims to replace the current WHO standard and resolve discrepancies in RF titer values among laboratories.
  • The proposed method involves expressing clinical serum RF titers as equivalent concentrations of mRF for standardized quantitative analysis.

Impact:

  • Implementation of the mRF standard is expected to eliminate inconsistencies in RF titer reporting across laboratories.
  • Improved standardization will enhance the reliability of RF testing for diagnosing and managing rheumatoid arthritis.
  • The development aligns with the inclusion of IgG-RF detection for medical insurance, aiding diagnosis of severe rheumatoid arthritis with vascular and extra-articular complications.

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