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[Reproducibility of C-reactive protein analyses]
Javier Llorca1, Magdalena González Quirós, Isabel Sampedro
1Medicina Preventiva y Salud Pública. Facultad de Medicina. Universidad de Cantabria. España. llorcaj@unican.es
Revista Espanola De Cardiologia
|October 18, 2002
Summary
Different nephelometric methods for measuring C-reactive protein (CRP) show high reproducibility. Ultrasensitive techniques are only necessary for CRP levels below 0.3 mg/dl.
Area of Science:
- Clinical Chemistry
- Immunochemistry
- Laboratory Medicine
Background:
- C-reactive protein (CRP) is a key biomarker for inflammation.
- Accurate and reliable measurement of CRP is crucial for clinical decision-making.
- Various nephelometric techniques are available for CRP quantification.
Purpose of the Study:
- To assess the reliability and reproducibility of different nephelometric methods for CRP measurement.
- To compare the performance of distinct nephelometric assays in quantifying CRP levels.
- To determine the clinical utility of standard versus ultrasensitive CRP assays.
Main Methods:
- A total of 120 patient samples were analyzed.
- Each sample was divided into three aliquots for analysis using three different nephelometric methods.
- Reliability was quantified using the kappa index and intraclass correlation coefficient (ICC).
Main Results:
- Intraclass correlation coefficients ranged from 0.78 to 0.94, indicating high reliability.
- When CRP values were categorized into four groups, the kappa index was 75-86% with 95-97% agreement.
- For two-group categorization, the kappa index was 73-78% with 86-89% agreement.
Conclusions:
- Standard nephelometric methods demonstrate high reproducibility for CRP measurement, even across different analysts.
- Ultrasensitive CRP assays are recommended only for detecting levels below 0.3 mg/dl.
- Current nephelometric techniques are reliable for routine clinical assessment of CRP.