Reduction of error rates in the microlymphocytotoxicity test

Area of Science:

• Immunology
• Clinical Diagnostics

Background:

• The microlymphocytotoxicity test is a critical method for HLA typing and antibody screening.
• Historically, the test has faced challenges with a notable overall error rate impacting diagnostic accuracy.

Purpose of the Study:

• To analyze the reduction in the overall error rate of the microlymphocytotoxicity test.
• To identify the contributing factors and types of errors in the test.

Main Methods:

• Analysis of 882 replicate test pairs and family studies to assess error rates.
• Comparison of error rates from 1971 to the present, correlating with technical advancements.

Main Results:

• The overall error rate decreased from 1.08% in 1971 to approximately 0.35%.
• Reading errors account for 0.11% of the total error rate.
• Improvements in automation, incubation control, cell preparation, and serum quality were key factors.
• Random, sera-related, and lymphocyte-related errors were identified, with lymphocyte-related issues in less than 4% of tests.

Conclusions:

• Significant improvements in methodology have drastically reduced microlymphocytotoxicity test errors.
• Automation and enhanced reagent specificity are crucial for improving test reliability.
• Understanding error sources allows for continued refinement of diagnostic immunology techniques.