Dilantin-125®, Phenytek®
9 days
Total: immunoassay, Free: ultrafiltrate assayed by immunoassay
Accredited Laboratory Partner
Contact Technical Support
Measures both total and free phenytoin levels. Used in seizure management.
Serum or Plasma
3 mL
Red-top tube or green-top (heparin) tube.
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.
| Temperature | Period |
|---|---|
| Room temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |