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Related Experiment Videos

Four immunochemical methods for measuring C-reactive protein in plasma compared.

S Grützmeier1, H von Schenck

  • 1Department of Internal Medicine, University Hospital, Linköping, Sweden.

Clinical Chemistry
|March 1, 1989
PubMed
Summary

Comparing four C-reactive protein (CRP) measurement methods, radial immunodiffusion (RID) and electroimmunoassay (EIA) showed close agreement. Immunoturbidimetry (IT) also agreed well with RID and EIA, but laser nephelometry (LN) performance declined over time.

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Area of Science:

  • Clinical Chemistry
  • Immunology
  • Biochemical Assays

Background:

  • C-reactive protein (CRP) is a key biomarker for inflammation.
  • Accurate measurement of CRP is crucial for clinical diagnosis and monitoring.
  • Several immunochemical methods exist for quantifying CRP in plasma.

Purpose of the Study:

  • To compare the accuracy and agreement of four different immunochemical methods for measuring C-reactive protein (CRP) in plasma.
  • To evaluate the long-term performance consistency of these methods, particularly laser nephelometry (LN).

Main Methods:

  • Comparison of radial immunodiffusion (RID), electroimmunoassay (EIA), immunoturbidimetry (IT), and laser nephelometry (LN) for CRP quantification.
  • Statistical analysis of agreement between methods using regression analysis and correlation coefficients.

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  • Investigation into potential reasons for observed discrepancies, including method-specific factors.

    • Main Results:

    • Close agreement was observed between RID and EIA (r=0.977), IT and EIA (r=0.951), and IT and RID (r=0.959).
    • Initial good agreement between LN and RID (r=0.973) deteriorated by 1986.
    • Laser nephelometry showed poor agreement with other methods in the later study period.

    Conclusions:

    • Radial immunodiffusion, electroimmunoassay, and immunoturbidimetry are reliable methods for CRP measurement with good inter-method agreement.
    • Laser nephelometry exhibited a decline in performance over time, suggesting instrumentation issues rather than biological degradation of CRP.
    • The study advises against the continued use of the specific laser nephelometry instrumentation due to performance inconsistencies.