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Dilution integrity at a ten-fold dilution was acceptable as analyte concentrations ranged between (±18%) of the target concentration. Once validated, the method was used in a pilot dosing study of one male subject after taking a 10 mg immediate release tablet of oxycodone. Blood samples were collected at 0.25, 0.50, 0.75, 1.0, 1.5, 2, 3, 4, 5, 6, 8, 9, and 24 h after ingestion. Oxycodone and noroxycodone both reached Tmax at 1.5 h and had Cmax values of 25.9 and 12.8 ng/mL, respectively. Oxycodone, 6α-oxycodol, and 6β-oxycodol were dete