Detect the presence of phentermine, a prescription stimulant
Serum, plasma, or whole blood
Serum: Red-top tube or green-top (heparin) tube, gel-barrier tubes are not recommended. Whole blood: Lavender-top (EDTA) tube, gray-top (sodium fluoride) tube, or green-top (heparin) tube
Serum or plasma should be separated from cells within two hours of venipuncture. Submit serum or plasma in a plastic transport tube.
Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen.