Therapeutic drug management
Dk green heparin (Li or Na), no gel
Immediately following collection, mix sample 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)
1000 - 2500 ng/mL
>10,000 ng/mL