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Clinical Chemistry 34: 155-157, 1988;
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Clinical Chemistry, Vol 34, 155-157, Copyright © 1988 by American Association for Clinical Chemistry

Two dry-reagent systems evaluated for determinations of enzyme activities

JC Hafkenscheid and J van der Ven-Jongekrijg
Department of Internal Medicine, St. Radboud Ziekenhuis, Nijmegen, The Netherlands.

We evaluated the Kodak Ektachem DT60/DTSC and the Boehringer Mannheim Reflotron for measuring activity concentrations of six enzymes. The Ektachem CVs for low concentrations of aspartate aminotransferase and alanine aminotransferase were high. As compared with the Ektachem and a routine "wet-chemistry" system, values for aspartate aminotransferase and alanine aminotransferase were lower as measured by the Reflotron, because no pyridoxal 5'-phosphate is included in the Reflotron slides. Activity concentrations of gamma-glutamyltransferase and creatine kinase measured with the Ektachem and with the routine procedure did not agree well, possibly because the Ektachem gave too-high results for the enzyme activities. Assays of several commercial test sera indicated that test results by the dry-chemistry and routine procedures are not interconvertible. This contrasts with our previous experience, in which between-test agreement for several analytes was acceptable.




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