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Improved immunoturbidimetric method for rheumatoid factor testing

M Nykänen1, T Palosuo, K Aho

  • 1National Public Health Institute, Helsinski, Finland.

Journal of Clinical Pathology
|November 1, 1993
PubMed
Summary
This summary is machine-generated.

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Comparing two rheumatoid factor (RF) tests, chemical inactivation showed better reproducibility and may offer more accurate RF concentration measurements than heat inactivation for rheumatoid arthritis diagnosis.

Area of Science:

  • Clinical Chemistry
  • Immunology

Background:

  • Rheumatoid factor (RF) is a key biomarker in rheumatoid arthritis (RA) diagnosis.
  • Accurate RF quantification is crucial for clinical decision-making.
  • Complement inactivation methods can influence RF assay performance.

Purpose of the Study:

  • To compare the performance of two immunoturbidimetric RF assays.
  • To evaluate RF detection using heat inactivation versus chemical inactivation (polyvinyl sulphonate).
  • To assess assay reproducibility and correlation with ELISA.

Main Methods:

  • Two immunoturbidimetric methods for RF testing were compared.
  • Serum samples from 87 RA patients and 403 healthy subjects were analyzed.
  • IgM-RF titers were also measured using ELISA.

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Main Results:

  • Both immunoturbidimetric tests detected RF in 85% of RA sera.
  • Chemical inactivation showed slightly higher RF results in high-concentration samples.
  • Chemical inactivation demonstrated superior inter-run reproducibility (4.4% CV) compared to heat inactivation (8.1% CV).
  • Higher correlation was observed with ELISA results using chemical inactivation.

Conclusions:

  • Chemical inactivation of complement using polyvinyl sulphonate offers advantages for RF testing.
  • This method provides easier test performance and better reproducibility.
  • Results from chemical inactivation may more accurately reflect true rheumatoid factor concentrations.