| Synonyms:
| Phenytoin |
| Specimen: | Blood; (1) Red (no preservative) top vacutainer tube.
Collect as a trough sample prior to dose. If receiving IV dose, collect 1-4 hours after dose completion. Include dosing schedule on request form. |
| Volume: | Full primary tube |
| Minimum Volume: | 200 microL serum |
| Collection: | Separate and transfer serum to a tightly capped plastic aliquot tube for transport.
Refrigerate at 2-8°C |
| Rejection Criteria: | Specimen received in an SST (serum separator) tube; quantity not sufficient for testing; improper labeling.. |
| Reference Range: | Therapeutic= 10-20 mcg/ml Toxic- greater than 30mcg/mL |
| Methodology: | |
| Test Use: | Used to monitor therapeutic and prevent toxic levels of pheytoins. Phenytoin (Dilantin) is a primary drug used for all types of seizures except absence seizure. |
| Additional Information: | |
| Testing Includes: | Quantitative measurement of phenytoin, (dilantin, diphenylhydantoin), an anti-epileptic drug. |
| Testing Facility: | AnMed Laboratory |