Collect
One red top serum vacutainer (no gel)
Minimum 0.5mL
Pharmacokinetic factors influence the correct time of sample collection after the last drug dose. These factors include; dosage form, mode of administration, concomitant drug therapy, and biological variations affecting drug disposition.
Collect a trough sample just before the next scheduled dose. When adjusting dosage, measure peak and trough levels during the same dosing interval.
Specimen Preparation
Allow to clot for 30 minutes in an upright position prior to centrifugation. Centrifuge within 60 minutes of collection.
Pediatric Collection
Minimum volume: 0.2mL serum
Preferred volume: 0.5mL serum
Unacceptable Conditions
Moderate/severe hemolysis, sample not properly identified; incorrect container; insufficient sample volume.
Storage Transport Temp
Send refrigerated (2-8°C)
Stability
Before centrifugation: 1 hour RT
After centrifugation: Refrigerated (2-8C), 2 weeks.