Specimen Requirements

Submit only 1 of the following specimens:
 
Plasma
Draw blood in a green-top (lithium heparin) tube(s). Spin down and send 1 mL (pediatric:  0.2 mL) of lithium heparin plasma. Plasma for a trough level is usually drawn 15 minutes before dose.
Note:  1. Date and time of draw and trough plasma are required on request form for processing.

2. Label specimens appropriately (corresponding draw time and as trough plasma).

Serum
Draw blood in a plain, red-top tube(s) or a serum gel tube(s). Spin down and send 1 mL (pediatric:  0.2 mL) of serum. Serum for a trough level is usually drawn 15 minutes before dose.
Note:  1. Date and time of draw and trough serum are required on request form for processing.

2. Label specimens appropriately (corresponding draw time and as trough serum).