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Multicenter evaluation of five assays for myoglobin determination
M Zaninotto1, F Pagani, S Altinier
1Dipartimento di Medicina di Laboratorio, Università-Ospedale, 35100 Padova, Italy.
Clinical Chemistry
|October 6, 2000
Summary
Commercial myoglobin assays show significant variability in precision and results, impacting clinical practice. Standardization is crucial for accurate myoglobin measurement across different laboratory methods.
Area of Science:
- Clinical Chemistry
- Biomarker Analysis
- Diagnostic Assay Evaluation
Background:
- Lack of standardization in myoglobin assays leads to significant result discrepancies.
- Accurate myoglobin measurement is critical for diagnosing various medical conditions.
Purpose of the Study:
- To compare the analytical performance of five commercial myoglobin assays.
- To evaluate assay precision, interferences, and method agreement.
Main Methods:
- A multicenter study assessed linearity, imprecision, interferences, and method comparison using NCCLS guidelines.
- Reference values were determined following IFCC recommendations.
- Five commercially available myoglobin assays were analyzed.
Main Results:
- Assay imprecision varied, with some showing total CVs >7.4%.
- Sample matrix (anticoagulants, separator gel) and rheumatoid factor affected results differently across assays.
- High correlation coefficients (>=0.98) were observed, but absolute results and reference limits differed significantly.
Conclusions:
- Significant imprecision and disagreement exist among commercial myoglobin assays.
- Clinical practice must consider potential variability in myoglobin test results.
- Assay standardization is essential for reliable myoglobin quantification.