Test ID: Z0516
CPT code: 80167
LOINC: 6899-9
Specimen Type: Red, Lav(EDTA) OR green(heparin). NO SST
Frequency: 2 – 4 days one working day.
Instructions: 2 mL Serum or Plasma from Red, Lav(EDTA) OR green(heparin). Ambient, Do not use a SST. Min 0.6 mL.
Text: Useful For: Determining whether a poor therapeutic response is
attributable to noncompliance or lack of drug effectiveness; Monitoring changes in serum concentrations resulting from interactions with coadministered drugs such as barbiturates and phenytoin.
Methodology: Liquid chromatography/tandem mass spectrometry (LC/MS-MS)