Therapeutic drug management
Dk green heparin (Li or Na), no gel
Immediately following collection, mix sample thoroughly by gentle inverting 8 - 10 times to prevent clotting
Serum/plasma transfer vial/tube (MedTox)
Refrigerated (preferred)
Ambient - 3 days
Frozen (OK)
Gel-barrier tubes are not recommended
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
180 - 300 ng/mL
>1,000 ng/mL