Collection Requirements

Specimen: Serum, plasma, or whole blood

Volume: 0.3 mL

Minimum Volume: 0.1 mL

Container: Red-top tube, lavender-top (EDTA) tube, or green-top (heparin) tube. Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.

Collection: Separate serum or plasma within one hour of collection and transfer to a plastic transport tube. Transport at refrigerated temperature.