Therapeutic drug management
Trough levels are most reproducible
Dk green heparin, no gel
Immediatley following collection, mix sample thoroughly by gentle 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)
Expected steady state plasma levels in patients receiving recommended daily dosages is 109.0 - 585.0 ng/mL