Therapeutic drug management
Dk green heparin (Li or Na), no gel
Immediatley following collection, mix by inverting 5 - 10 times to prevent clotting
Refrigerated (preferred)
Ambient - 3 days
Frozen (OK)
Gel-barrier tubes are not recommended
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
100 - 300 ng/mL
>1,000 ng/mL