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Cross-reactivity of the CEDIA buprenorphine assay with opiates: an Austrian phenomenon?
M Pavlic1, K Libiseller, P Grubwieser
1Institute of Legal Medicine, Innsbruck Medical University, Muellerstrabe 44, 6020 Innsbruck, Austria. marion.pavlic@uibk.ac.at
Abstract:
When testing the Microgenics CEDIA assay for immunological buprenorphine analysis, cross-reactivity between the buprenorphine reagents and opiates was observed at concentrations higher than 120 mg/l morphine, 320 mg/l methadone, 30 mg/l codeine, 60 mg/l dihydrocodeine and 520 mg/l morphine-3-glucuronide. The cross-reactivity with morphine has the greatest impact on routine screening as opiate maintenance therapy in Austria is also performed with slow-release oral morphine. The use of a second cutoff value of 30 mug/l for urine samples that are (immunologically) positive for opiates is therefore suggested, compared to the cutoff value of 5 microg/l proposed by the manufacturer.
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