Therapeutic drug management
Collect at steady state
Dk green heparin (Li or Na), no gel
Immediately following collection, mix sample thoroughly by gently inverting 5 - 10 times, to prevent clotting
Refrigerated (preferred)
Ambient - 3 days
Frozen (OK)
Gel-barrier tubes are not recommended
Immunoassay (IA)
1.2 - 6.0 µg/mL
>8.0 µg/mL