Recommendations when to order or not order the test. May include related or preferred tests.
Optimize drug therapy and monitor patient adherence.
Unique test identifier.
Process(es) used to perform the test.
Quantitative Enzyme Immunoassay
Days of the week the test is performed.
Expected turnaround time for a result, beginning when ARUP has received the specimen.
New York DOH Approval Status
Indicates test has been approved by the New York State Department of Health.
This test is New York DOH approved.
Timing of specimen collection: Pre-dose (trough) draw - At steady state concentration.
Plain Red. Also acceptable: Lavender (K2or K3EDTA) or Pink (K2EDTA).
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: 0.5 mL)
Whole blood. Gel separator tubes, light blue (citrate), or yellow (SPS or ACD solution).
After separation from cells: Ambient: 5 days; Refrigerated: 1 week; Frozen: 2 months
Normal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Background information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
The therapeutic range is based on serum pre-dose (trough) draw at steady-state concentration. Toxic concentrations may cause dizziness, drowsiness and anorexia. The incidence of adverse reactions is low; however, life-threatening agranulocytosis and fatal pancytopenia have been reported.
Toxic: > 150 µg/mL
Additional information related to the test.
The American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.