Specimen Requirements

Please use preferred tube types whenever possible.

Preferred Container/Tube Type: Green Top (Lithium Heparin) Tube

Alternate Serum Separator Tube (SST)

Transport refrigerated

Collection Instructions: 

• The peak specimen for oral dosing should be drawn 2 hours after dose for rapid release and 4 to 6 hours after dose for sustained release.
• The peak specimen for intravenous dosing should be drawn 30 minutes after leading dose.
• A trough specimen should be drawn before next dose.
• A trough specimen is preferred for oral and intermittent intravenous dosing.
• For steady state dosing via continuous intravenous infusion, a specimen should be drawn 12 to 24 hours after starting the infusion.

Note: Date and time of last dose are required.