Therapeutic drug management
Trough levels are most reproducible
Dk green heparin (Li or Na), no gel
Immediately following collection, mix sample thoroughly by gently inverting 8 - 10 times, to prevent clotting
Serum/plasma transfer vial/tube (MedTox)
Refrigerated (preferred)
Ambient - 3 days
Frozen
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
175 - 300 ng/mL