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Biological variation of acute phase proteins
1Ninewells Hospital and Medical School, Dundee, Scotland, UK.
Annals of Clinical Biochemistry
|July 1, 1993
Summary
This study analyzed biological variation in 7 serum proteins for 19 healthy individuals over 20 weeks. Results show significant individuality, questioning population-based reference values for monitoring patients.
Area of Science:
- Clinical chemistry and biomarker analysis.
- Human physiology and variation studies.
- Biomarker assay validation and interpretation.
Background:
- Understanding biological variation is crucial for interpreting clinical laboratory results.
- Established reference ranges may not adequately capture individual protein variability.
- Assessing analytical and biological variation informs diagnostic accuracy.
Purpose of the Study:
- To quantify analytical and biological variation for seven key serum proteins.
- To evaluate the suitability of current analytical goals against biological variation.
- To assess the utility of population-based reference values for individual monitoring.
Main Methods:
- Longitudinal study design with 19 healthy subjects over 20 weeks.
- Estimation of within-subject and between-subject variation components.
- Analysis of serum albumin, transthyretin, alpha 1-acid glycoprotein, alpha 1-antichymotrypsin, haptoglobin, beta 2-microglobulin, and C-reactive protein.
Main Results:
- Significant individuality observed across all measured proteins.
- Analytical goals met for most proteins, but improvements needed for serum albumin and beta 2-microglobulin.
- Marked differences in critical change values necessitate protein-specific monitoring criteria.
Conclusions:
- Individual biological variation significantly impacts interpretation of serum protein levels.
- Conventional population-based reference values may be insufficient for precise individual health monitoring.
- Objective criteria for monitoring individuals can be derived from biological variation data.
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