A technique for the objective assessment of routine analytical methods in clinical laboratories using pattern...

Area of Science:

• Clinical Laboratory Science
• Analytical Chemistry
• Biostatistics

Background:

• Routine analytical methods in clinical laboratories require objective reliability assessments.
• Existing quality control programs provide data on method performance.
• Assessing method reliability is crucial for accurate patient diagnostics.

Purpose of the Study:

• To present a novel technique for objectively evaluating the reliability of routine analytical methods in clinical laboratories.
• To utilize data from external/internal quality control programs for method assessment.
• To establish a framework for distinguishing between different analytical methods based on performance characteristics.

Main Methods:

• Describing method performance using four features: accuracy, day-to-day precision, susceptibility to erroneous results, and susceptibility to systematic laboratory errors.
• Representing method performance as 'patterns' in a four-dimensional space.
• Applying pattern recognition techniques to cluster these patterns from multiple trials.
• Using a weighting procedure to determine the importance of each feature for cluster discrimination.

Main Results:

• Six trials generated multiple 'patterns' per analytical method, which were clustered in the four-dimensional space.
• Pattern recognition successfully identified clusters corresponding to the same or comparable analytical methods.
• A weighting procedure highlighted that different features are important for discriminating between methods for various blood components.
• The mean feature values within a cluster objectively define the quality of that cluster and, by extension, the analytical method.

Conclusions:

• The presented technique objectively assesses the quality and reliability of analytical methods used in clinical laboratories.
• Analytical methods can be distinguished from each other based on their performance patterns.
• The findings provide a basis for tentative conclusions regarding the validity of specific analytical methods.