Influence of isoenzyme patterns on commutability in enzyme determinations

Area of Science:

• Clinical Biochemistry
• Analytical Chemistry
• Diagnostic Assays

Background:

• Recommended methods have enhanced precision and accuracy in enzymatic determinations.
• Enzyme reference materials are essential for overcoming remaining standardization challenges.
• Commutability of calibration materials is key to extending standardization across different analytical methods.

Purpose of the Study:

• To investigate the influence of clinical factors, specifically varying isoenzyme content in patient sera due to different pathologies, on the commutability of enzyme reference materials.
• To assess the impact of these clinical variations on the accuracy of enzymatic determinations.
• To propose a model for investigating and assessing commutability in enzyme assays.

Main Methods:

• Analytical investigation of isoenzymes in individual clinical samples.
• Determination of alkaline phosphatase (ALP), creatine kinase (CK), and lactate dehydrogenase (LD).
• Utilizing a model for experimental protocols to assess commutability.

Main Results:

• The study analyzed the effect of differing isoenzyme profiles in patient samples on assay results.
• Results for ALP, CK, and LD demonstrated the influence of clinical variations on reference material performance.
• The proposed model provides a framework for evaluating commutability under diverse clinical conditions.

Conclusions:

• Commutability is influenced by both analytical and clinical factors, particularly isoenzyme variations in patient samples.
• Accurate assessment of commutability is vital for reliable standardization of enzymatic tests.
• The developed investigation model can be applied to assess the suitability of reference materials for clinical diagnostics.