Improved alanine aminotransferase assay using the microtiter plate.

Area of Science:

• Clinical Chemistry
• Biomedical Engineering
• Assay Development

Background:

• Alanine aminotransferase (ALT) assays are crucial for diagnosing liver conditions.
• Existing ALT assay methods can be time-consuming and prone to variability.
• Improvements in automation and precision are needed for reliable clinical diagnostics.

Purpose of the Study:

• To develop and validate a novel, automated procedure for alanine aminotransferase (ALT) determination.
• To enhance the precision, reproducibility, and efficiency of ALT assays using microtiter plate technology.
• To reduce variability and potential errors in ALT measurements through advanced automation and temperature control.

Main Methods:

• Utilized 96-well microtiter plates for simultaneous sample and reagent handling.
• Employed a computer-controlled multiple syringe for precise and reproducible volume dispensing.
• Implemented active temperature regulation systems to maintain consistent reaction conditions (±0.05°C).
• Incorporated computerized kinetic analysis to exclude false-positive and false-negative results.

Main Results:

• Demonstrated high reproducibility in volume dispensing (CV=0.6% for simultaneous, CV=0.5% for repeated filling).
• Achieved minimal temperature variation (±0.05°C) during the assay process.
• Showed low variability in ALT values across different ranges (CV < 2.3%) with the new method.
• Established excellent correlation with conventional methods (r > 0.9900) for ALT values ranging from 1-154 U/L.

Conclusions:

• The new automated method significantly improves the precision and reproducibility of ALT assays.
• The system offers enhanced accuracy by minimizing variability and excluding erroneous results through computerized evaluation.
• This efficient and simple method holds potential for broader application in kinetic-based serum constituent determinations.