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Phenytoin
Test Code3048
Alias/See Also
Dilantin
Preferred Specimen
One 5 mL plain red.
Minimum Volume
1 mL serum at 2-8°C. (Min: 0.2 mL) Submit specimen in an ARUP Standard Transport Tube.
Transport Temperature
1 mL serum at 2-8°C. (Min: 0.2 mL) Submit specimen in an ARUP Standard Transport Tube.
Specimen Stability
After separation from cells: Ambient: 8 hours; Refrigerated: 4 days; Frozen: 1 month
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Specimens collected in separator tubes, sodium fluoride, potassium oxalate, EDTA tubes. Hemolyzed specimens.
Methodology
Enzyme Immunoassay
Setup Schedule
Sun-Sat
Report Available
Within 24 hours
Limitations
Allow specimen to clot completely at room temperature. Separate serum from cells ASAP. Avoid use of separator tubes and gels.
Clinical Significance
Falsely elevated phenytoin levels may occur in critically ill, uremic patients receiving fosphenytoin.
