Detect presence of antihistamine drugs
Urine (random), serum, plasma, or whole blood
10 mL urine;
5 mL serum, plasma, or whole blood
Serum or plasma: Red-top tube or green-top (heparin) tube, gel-barrier tubes are not acceptable.
Whole blood: Lavender-top (EDTA) tube, gray-top (sodium fluoride) tube, or green-top (heparin) tube.
Urine: plastic urine container without preservative
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.