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Deming regression analysis of drug-free human serum spiked with morphine (A), morphine-6-β-glucuronide (B), morphine-3-β-glucuronide (C), and hydromorphone (D) comparing the described method (HPLC-MS/MS Vantage) to NMS Labs UPLC-MS/MS method. Slope, intercept, and Pearson's coefficient (R) are indicated for each analyte.
