Published: Journal of Analytical Toxicology, Volume 22, Number 5, September 1998, pp. 393–395.
False-Positive LSD Testing in Urine
Samples from Intensive Care Patients
J. Röhrich, S. Zörntlein, J.
Lotz, J. Becker, T. Kern, and C. Rittner
Unexpected positive results for lysergic acid diethylamide (LSD) were found in urine samples from 12 patients in an intensive care unit in a routine screening using the CEDIA® DAU assay. None of these test results could be confirmed by high-performance liquid chromatography analysis, but all samples contained the mucolytic drug ambroxol. Further studies demonstrated that ambroxol exhibits a significant cross-reactivity in the CEDIA DAU LSD assay. Therefore, positive LSD results obtained with the CEDIA DAU assay have to be critically evaluated, particularly during the cold season, when infections of the respiratory tract often result in more frequent use of mucolytic medications.
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