Monitor patient adherence.
Quantitative High Performance Liquid Chromatography-Tandem Mass Spectrometry
Plain Red, Lavender (EDTA), or Pink (K2EDTA).
Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.45 mL)
Refrigerated. Also acceptable: Room temperature or frozen.
Test is not performed at ARUP; separate specimens must be submitted when multiple tests are ordered.
Ambient: 2 weeks; Refrigerated: 2 weeks; Frozen: 11 months
Performed by non-ARUP Laboratory
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.
80373 (Alt code: G0480)
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National Medical Services (NMS)