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Clinical Chemistry 21: 1107-1112, 1975;
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Clinical Chemistry, Vol 21, 1107-1112, Copyright © 1975 by the American Association for Clinical Chemistry

Evaluation of the Beckman "System TR Enzyme Analyzer"

Richard Passey 1, Ronald L. Gillum 1, Mary Louise Giles 1, and John B. Fuller 1

1 Clinical Laboratories, University of Texas Medical Branch, Galveston, Tex. 77550.

We evaluated 16 claims made by Beckman Instruments, Inc. for its Enzyme Analyzer (System TR), under a rigid written protocol for the Product Evaluation Subcommittee of the Standards Committee of the College of American Pathologists. We found the following to be within the company's specifications: (a) accuracy and precision of the temperature control; (b) accuracy and precision of the sample and reagent pipets; (c) instrument precision, both within-run and between-day; (d) carry-over from a sample with activity > 1000 U/liter; (e) instrument-to-instrument variation; (f) analytical linearity; (g) analysis time; (h) correlation of the instrumentprinted answer with the activity calculated manually from a strip-chart recorder; (i) precision of the instrument's built-in electronic "standard"; (j) effectiveness of the over-range indicators; and (k) correlation between results of these enzyme assay methods and those for kinetic methods used in our laboratory. The instrument performed well.


Key Words: analytical error • enzyme activity • "kit" method • analytical system

Submitted on December 23, 1974
Accepted on April 21, 1975






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Copyright © 1975 by the American Association for Clinical Chemistry.