L043

Test CODE NAME

L043

Oxcarbazepine, Serum

Methodology: Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Performed: Varies
Reported: 3-4 days
Specimen Required: Collect: Red-top tube OR Lavender-top (EDTA) tube - 1 ml serum or plasma. 
Test Includes:  Analysis of active metabolite, 10-hydroxy carbamazepine (MHD) 
Specimen Collection: Transfer separated serum or plasma to a plastic transport tube. Draw trough levels immediately prior to next dose. Steady-state levels are reached within two to three days in patients taking oxcarbazepine twice daily. 
Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant. 
Causes for Rejection:  Gross lipemia; hemolysis; icteric specimen; gel-barrier tube 
Storage/Transport Temperature: Refrigerated 
Stability: Room Temperature/Refrigerated - 1 week, Frozen - 1 month 
Note: This test is approved for NY . 
Performing Lab 
LabCorp Laboratory Corporation of America
CPT Code(s): 80183