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Test Code



Testing performed with serum on Beckman Coulter DxC 700 AU analyzer.

Test Utility

Used to diagnose overdose and monitoring its levels in patients to ensure appropriate therapy.

Specimen Storage and Stability

Store the serum refrigerated at 2-8C for up to 7 days or stored frozen (-20C) for up to 6 months.

Specimen Collection and Preparation

Serum sample required, volume needs to be at least 2.0mL, Gold Top or Tiger SST. Free from hemolysis, whole blood cannot be used.

Specimen Rejection

  • Improperly labeled

  • Specimen grossly

  • Hemolyzed uncentrifuged

Reference Ranges

Therapeutic Peak Range = 4.0 - 8.0ug/mL

Therapeutic Trough Range = 0.5 - 1.5ug/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

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