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Read More. Its my understanding that Suboxone stays is in your system for at least 72 hours and has trace metabolites that can be detected in urine for up to 10 days (depending on strength and how long one has been on it). If you've been clean for 18 days you should have no worries.
The Buprenorphine urine drug test uses Buprenorphine as the calibrator for the stated 10 ng/mL testing level. The following table lists the concentrations of compounds (ng/mL) that are detected as positive in this urine drug test. Suboxone Drug Test Instructions.