Serum: Collect sample in Red top tube
Plasma: Collect sample in Lavender top tube (EDTA) or Pink top tube.
Peak serum levels are recommended when monitoring patients because the level in the blood drops so rapidly that many negative results are found at the trough. The peak occurs at 40 to 90 minutes post dose.
Plastic container (preservative-free)
Polymer gel separation tube (SST or PST).
Rejection criteria pertain to clinical sample submissions only.
Room Temperature: 30 day(s)
Refrigerated: 30 day(s)
Frozen (-20 °C): 4 month(s)