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4. Method P898. Quantitation of unconjugated phenylephrine in human plasma via HPLC with MS/MS detection, Issued Feb 2009. Middleton: PPD Bioanalytical Laboratory.
5. Method P956. Quantitation of phenylephrine and phenylephrine glucuronide in human urine via HPLC with MS/MS detection. Issued Feb 2009. Middleton: PPD Bioanalytical Laboratory.