[Serum myoglobin: evaluation of two immunolatex methods. Comparison with a radioimmunoassay method]

Area of Science:

• Clinical Chemistry
• Immunodiagnostics
• Biomarker Analysis

Background:

• Serum myoglobin is a critical biomarker for diagnosing muscle damage and certain cardiac conditions.
• Traditional radioimmunological assays (RIA) for myoglobin are accurate but involve radioactive materials and longer turnaround times.
• Development of non-radioactive, rapid immunoassays is crucial for efficient clinical laboratory diagnostics.

Purpose of the Study:

• To evaluate and compare the performance of latex immunoturbidimetric (ITA) and immunonephelemetric (INA) assays for serum myoglobin determination.
• To assess the correlation of these latex assays with the established radioimmunological assay (RIA).
• To establish reference values for myoglobin using the developed latex assays.

Main Methods:

• Evaluation of within-run and between-run precision, accuracy, and linearity for ITA and INA.
• Correlation analysis of ITA and INA results against RIA using 100 patient serum samples (up to 2,000 µg/L).
• Determination of reference ranges in a cohort of 300 individuals (150 men, 150 women, aged 20-65 years).

Main Results:

• Both ITA and INA demonstrated satisfactory performance, yielding results highly similar to RIA.
• High correlation coefficients were observed: 0.96 for ITA and 0.97 for INA, indicating excellent agreement with RIA.
• Established reference values were determined and expressed in percentiles for both sexes.

Conclusions:

• Latex immunoturbidimetric (ITA) and immunonephelemetric (INA) assays are effective, non-radioactive methods for serum myoglobin quantification.
• ITA is particularly suitable for rapid, emergency testing, while INA offers convenience for serial testing and complex samples.
• These assays facilitate efficient laboratory myoglobin evaluation with reduced performance time and enhanced safety.