Home
HelpPhenytoin Level, Total and Free
eDH Procedure Code(s)
LAB176 Phenytoin Level, Total and Free
Test Information
Free phenytoin testing is not indicated for subtherapeutic total phenytoin level <6.0 mg/L.
Testing will not be performed if ordered more than once per calendar day.
Specimen Information
| Specimen Type | Specimen Source | Acceptable Containers | Minimum Test Volume (mL) | |
|---|---|---|---|---|
| Blood | Blood, Venous | Gold-R | 0.5 | |
Shipping and Handling
Processing Instructions: N/ATransport Temperature: Refrigerated
Transport Instructions: N/A
Specimen Stability Unprocessed
Unprocessed: 4 Hours
Specimen Stability Post Processing
Ambient: 4 Days (Before filtering, but spun)
Refrigerate: 4 Days (Before filtering, but spun)
Frozen: 1 Month (Before filtering, but spun)
Test Components
| Component | LOINC Code |
|---|---|
| PHENYTOIN FREE % | 10548-6 |
| PHENYTOIN, FREE | 3969-3 |
| PHENYTOIN | 3968-5 |
Turnaround Time (TAT)
24 Hours
CPT Code(s)
LAB176 Phenytoin level, total and free: 80186
80185
Performing Lab Section
Chemistry
Performing Lab(s)
Dartmouth Hitchcock Medical Center Laboratory (MHMH)