Therapeutic drug management
Trough levels are most reproducible
Dk green heparin (Li or Na), no gel
Immediately following collection, mix sample thoroughly by gently inverting 8 - 10 times to prevent clotting
Refrigerated (preferred)
Ambient (OK) - 3 days
Frozen (OK)
Gel-barrier tubes are not recommended
High Performance Liquid Chromatography with Ultraviolet Detection; (HPLC-UV)
200 - 1600 ng/mL