Therapeutic drug management
Trough levels are most reproducible
Dk green heparin (Li or Na), no gel
Immediatley following collection, mix sample thoroughly by gentle inverting 8 - 10 times, to prevent clotting
Refrigerated (preferred) - 14 days
Ambient - 3 days
Frozen - 180 days
Gel-barrier tubes are not recommended
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
Expected in patients taking recommended dosages: up to 60.0 µg/mL