Specimen Requirements

Container/Tube Type: 

Green No Gel (Lithium Heparin)
Light Green (Lithium Heparin Plasma Separator Tube)

Also Acceptable: 

Red (No Additive)
SST (Serum Separator)

Minimum Sample Volume: 

0.5 mL

Remarks: 

Trough levels should be collected just before the next dose is given.