1 x 5 mL light green (mint) top PST tube. Gold top SST tube is also acceptable.
0.2 mL heparinized plasma or serum
Minimum Blood Volume for Patients less than 45 kg (100 lb) Including Neonates and Pediatrics
Two specimens required - one trough and one peak.
Specimens MUST be marked accordingly.
Trough (pre-dose): Collect 0-30 minutes prior to next dose.
Peak (post-dose): Collect 30 minutes after IV infusion or 1-2 hours after IM injection.
Collection time for once daily dosing regime is 6-14 hours after dose started (usually 8 hours).
RECORD time of last dose on requisition. | 
