Specimen Requirements

Submit only 1 of the following specimens:

Plasma
Draw blood in a green-top (lithium heparin) tube 4 hours after drug ingestion. This will ensure concentrations have peaked. Spin down and send 1 mL of lithium heparin plasma refrigerated.
Note:

• Half-life is 1 to 3 hours.
• Indicate plasma on request form.
• Label specimen appropriately (plasma).                                                                                                              

Serum

Draw blood in a gold SST tube 4 hours after drug ingestion. This will ensure concentrations have peaked. Spin down and send 1 mL of serum refrigerated.

Note:

• Half-life is 1 to 3 hours.
• Indicate serum on request form.
• Label specimen appropriately (serum).