Optimize drug therapy and monitor patient adherence.
Quantitative Enzyme Immunoassay
Within 24 hours
New York DOH Approval Status
Timing of specimen collection: Pre-dose (trough) draw - At steady state concentration.
Plain red. Also acceptable: Lavender (EDTA), pink (K2EDTA), or green (sodium or lithium heparin).
Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.3 mL)
Serum or plasma separator tubes. Grossly hemolyzed specimens.
After separation from cells: Ambient: 7 days; Refrigerated: 1 week; Frozen: 4 weeks
Effective November 18, 2013
Therapeutic Range: 2.5-15.0 µg/mL
Toxic: Not well established
Pharmacokinetics varies widely, particularly with co-medications and/or compromised renal function. Adverse effects may include dizziness, somnolence, nausea and vomiting.
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