Test Code



Testing performed on Beckman Coulter DxC 700 AU analyzing serum.

Test Utility

Used in the diagnosis of an overdose and in monitoring patients to ensure appropriate therapeutic levels are achieved.

Specimen Storage and Stability

Store the serum refrigerated at 2-8C. For transporting, maintain the sample temperature at 2-8C. Sample can be stored refrigerated at 2-8C for up to one month or stored frozen (-20C) for up to three months.

Specimen Collection and Preparation

Serum sample required, whole blood cannot be used. Sample volume minimum 2.0mL in Gold Top or Tiger SST, free from hemolysis.

Specimen Rejection

  • Improperly labeled

  • Specimen grossly

  • Hemolyzed uncentrifuged

Reference Ranges

Therapeutic Range = 2.00 - 20.00ug/mL


Monday - Saturday, 16 hours a day.

Result available after getting the specimen in 5 hours.

STAT results available within 2 hours of receipt in the Laboratory.

*NOTE: All Specimen Refrigerated (2-8°C) for 7 days only.


Vibra Health Laboratory

Phone: (248) 846-0663

1307 Allen Dr, Suite A, Troy, MI 48083