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Comparison of combined buprenorphine urine (A) or plasma (B) concentrations at all time points (n = 80) vs qualitative urine drug screen results (n = 79). Detection of buprenorphine on qualitative UDS was associated with higher urine and plasma concentrations in quantitative testing (P < .0001, P = .0021, respectively). Solid lines represent the median. Error bars represent range
