An empirical study on the selection of analytes and corresponding cutoffs for immunoassay and GC-MS in a two-step test strategy―buprenorphine example

(i) Standard solutions of buprenorphine (B) and three metabolites; (ii) immunoassay (IA) reagents designed for the analysis of B and/or its metabolites; and (iii) clinical urine specimens collected from patients (under B-treatment), constitute the B-System for fundamental study of parameters critica...

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