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HelpTest Code LAB31 Phenytoin Total
Specimen Requirements
Container/Tube:
Required: Serum (Red Top)
Specimen Volume: 1mL
Stability:
| Temperature | Time |
| Room Temp 18-28°C | 8 hours |
| Refrigerated 2–8°C | 7 days |
| Frozen <-18°C | 12 weeks |
Additional Instructions
Collection Time After Administration:IV: 2-4 hours after completion of a loading dose
PO: 24 hours after administration of a loading dose
On initiation of therapy: for second concentration, draw within 5-8 days after loading dose
Designate last dose date/time.
Therapeutic Range
Phenytoin level, total: 10-20 mcgToxic: >25 mcg/mL
Lethal: >100 mcg/ml
Synonyms
Chemistry
Department
Chemistry