Analysis of serum angiotensin-converting enzyme

Area of Science:

• Clinical Chemistry
• Genetics
• Pulmonology

Background:

• Serum angiotensin-converting enzyme (SACE) levels are influenced by genetic polymorphism.
• Accurate interpretation of SACE levels requires appropriate genotypic reference ranges for improved diagnostic sensitivity in conditions like sarcoidosis.
• SACE assays are widely performed in routine clinical laboratories.

Purpose of the Study:

• To evaluate the analytical performance of SACE assays.
• To assess the impact of genetic polymorphism and assay variability on diagnostic accuracy for sarcoidosis.
• To determine if SACE assays should be centralized in specialized laboratories.

Main Methods:

• Analysis of serum angiotensin-converting enzyme (SACE) levels.
• Assessment of genetic polymorphism influencing SACE.
• Evaluation of external quality assessment (EQA) data for SACE assays.
• Comparison of diagnostic classifications based on SACE results from different laboratories.

Main Results:

• External quality assessment (EQA) for SACE assays revealed poor analytical performance.
• A diversity of reference ranges among laboratories led to disparate clinical classifications of EQA samples.
• Genetic polymorphism, combined with poor analytical performance, complicates accurate SACE interpretation.

Conclusions:

• The analytical performance of SACE assays is currently inadequate for reliable routine use.
• Variability in SACE assay performance and reference ranges hinders accurate diagnosis of conditions like sarcoidosis.
• Centralizing SACE assays in specialized laboratories may be necessary to ensure diagnostic accuracy and improve patient care.