Collect red top or green top, centrifuge immediately, pipette 2 mL serum/plasma to a screw top plastic tube, indicate sample type on tube and send on dry ice. Ship samples Monday-Thursday only.
Gas Chromatography/Mass Spectrophotometry (GC/MS)
Room temp: 6 hours, past 6 hours sample must be kept frozen
2-9 days, Performed Mon-Fri