Therapeutic drug management
Trough levels are most reproducible
Immediately following collection, mix sample thoroughly by gently inverting 8 - 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)
<120.0 ng/mL
Not established