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Phenytoin (Dilantin®)
Test CodeDILAN
Preferred Specimen
Serum, 0.5 mL minimum
Instructions
Trough levels: ORAL draw immediately prior to next dose; IV 2-4 hours after load
Transport Container
SST tube
Transport Temperature
Specimen stable separated: 8 hours at room temp., 2 days refrigerated and longer if frozen
Reference Range
See report for normal ranges. Critical Value: >30 ug/mL
Clinical Significance
Phenytoin is considered the drug of choice for generalized major motor (grand mal epilepsy) and focal seizures.