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About This Test

Department: Biochemistry


  • Gel/clotted (yellow/red top)

Add-on requests are accepted


Turnaround Time:

Within 24 hours


Monitoring phenytoin therapy in patients commencing phenytoin, dose changes or investigation of toxicity/non-adherence

Reference ranges:

Age range Target range (mg/L)
All ages/sexes 5 - 20

Derived from Pathology Harmony 2011

Results outside the reference range do not necessarily indicate disease. Similarly, results within the reference range do not preclude abnormality. Please contact the Duty Biochemist for discussion of individual patient results

Other Comments:

For more information, please see the following: Phenytoin - Lab Tests Online