One 5 mL plain red top tube (no gel). Also acceptable: Plasma collected in lavender (EDTA) top tube.

Transfer 3 mL serum refrigerated (Min: 1.5 mL)

* Collection Instructions *

• Do not use gel barrier tubes.
• Centrifuge and immediately separate serum or plasma specimens from the cells into clean transport tube.

Patient Preparation

• Avoid contact of samples with plasticizers, varnishes, paint fumes, and fatty acids.
• Collect as trough just before next dose (optiumum time to collect sample: 1 hour before next dose).

Ambient: 48 hours

Refrigerated: 7 days

Frozen: 30 days

Gold (SST) top tube