Microsampling on the Technicon SMAC system.

Area of Science:

• Clinical Chemistry
• Analytical Chemistry
• Biomedical Engineering

Background:

• The Technicon SMAC continuous-flow analyzer traditionally requires a significant sample volume for comprehensive testing.
• Reducing sample volume is crucial for improving efficiency and accessibility in routine clinical diagnostics.

Purpose of the Study:

• To optimize the Technicon SMAC analyzer for reduced sample volume requirements in routine operation.
• To maintain or improve analytical performance while decreasing sample input.

Main Methods:

• Implemented sequential dialysis for creatinine and iron assays.
• Increased sample dilution from sixfold to ninefold.
• Minimized diluted sample stream wastage and enhanced sensitivity for glucose and alkaline phosphatase assays.
• Utilized a glycine-containing diluent to improve iron assay sensitivity and prevent protein precipitation.

Main Results:

• Achieved sample volume reduction to 141 microL (17-test profile) or 224 microL (including creatinine and iron).
• Demonstrated no deterioration in analyzer performance over nine months of routine operation with reduced sample size.
• Observed a 25% increase in iron method sensitivity with the glycine diluent.

Conclusions:

• The optimized Technicon SMAC analyzer effectively reduces sample volume for routine analysis.
• Reduced sample volume enhances efficiency, decreases calibration material consumption, and facilitates repeat testing without compromising accuracy.
• The modifications offer a practical advancement for continuous-flow analysis in clinical settings.