ARUP's Laboratory Test Directory
| 0090090: Phenytoin |
| Test Mnemonic: DIL | |
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#ExistMethodology>
Methodology: Enzyme Immunoassay
*ExistMethodology> #ExistPerformed> Performed: Sun-Sat *ExistPerformed> #ExistReported> Reported: Within 24 hours *ExistReported> |
| Specimen Required: | |
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#ExistCollect>
Collect: One 5 mL plain red.
*ExistCollect> #ExistTransport> Transport: 1 mL serum at 2-8°C. (Min: 0.2 mL) Submit specimen in an ARUP Standard Transport Tube. *ExistTransport> #ExistPedCollectTransport> Pediatric Collection/Transport: 0.2 mL serum at 2-8°C. *ExistPedCollectTransport> #ExistRemarks> Remarks: Allow specimen to clot completely at room temperature. Separate serum from cells ASAP. Avoid use of separator tubes and gels. *ExistRemarks> #ExistConditions> Unacceptable Conditions: Specimens collected in separator tubes, sodium fluoride, potassium oxalate, EDTA tubes. Hemolyzed specimens. *ExistConditions> #ExistStability> Stability: After separation from cells: Ambient: 8 hours; Refrigerated: 4 days; Frozen: 1 month *ExistStability> |
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| Reference Interval: |
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#ExistRefRange> 0-2 months: 6.0-14.0 µg/mL Toxic: 14.1 µg/mL or greater 3 months and older: 10.0-20.0 µg/mL Toxic: 30.1 µg/mL or greater *ExistRefRange> |
| Interpretive Data: | |
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#ExistInterpData>
Falsely elevated phenytoin levels may occur in critically ill, uremic patients receiving fosphenytoin.
*ExistInterpData> |
| CPT Code(s): | |
| 80185 |