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  • Title: Drug interference in clinical chemistry: studies on ascorbic acid.
    Author: Siest G, Appel W, Blijenberg GB, Capolaghi B, Galteau MM, Heusghem C, Hjelm M, Lauer KL, Le Perron B, Loppinet V, Love C, Royer RJ, Tognoni C, Wilding P.
    Journal: J Clin Chem Clin Biochem; 1978 Feb; 16(2):103-10. PubMed ID: 624909.
    Abstract:
    The expert group "Drug Interference in Clinical Chemistry" of the Bureau of Reference, Directorate General for Research, Science and Education of the Commission of the European Communities, consisting of one participant of each member of the European Communities, presents this first report on the final results of its activities. Within the framework of a first stage basic program, the paper describes interferences of therapeutic and elevated doses of ascorbic acid on commonly used clinical chemical methods. This is the result of a bipartite study that was jointly planned, carried out and evaluated. Local and personal influences have been eliminated, as have variations due to methodology, measurement equipment and reagents, in order to be able to present distinct causal effects of ascorbic acid. No definite influence of ascorbic acid on analytical values for urea, cholesterol, calcium, protein, bilirubin, aspartate aminotransferase and alkaline phosphatase could be detected. At therapeutic concentrations, ascorbic acid distinctly interferes with the analysis of glucose, uric acid, creatinine and inorganic phosphate. The extent and direction of interferences vary, depending on the type of reaction, kit and apparatus. In some cases the influence of ascorbic acid results in severe disturbance of the analytical methods leading to useless values.
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