Draw immediately before next scheduled dose. Also appropriate is drawing 12 hours after an oral dose.
Collect red top, centrifuge and transfer 1.0 mL serum to a screw top plastic vial within 2 hours of collection, indicate sample type on tube and send.
Liquid Chromatography/Tandem Mass Spectrometry
Room temp: 28 days, Refrigerated: 28 days, Frozen: 28 days
3-5 days performed Monday, Wednesday