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HelpTest Code PTN Phenytoin Level (Dilantin)
Performing Location
Specimen Collection Information
| Specimen | Min. Test Volume | Collection Container | Special Handling |
|---|---|---|---|
| Blood | 0.1 mL | Light Green (lith. heparin) top Gold top Marble Red top |
Reference Ranges & Critical Values
| Assay | Gender | Age Range | Normal Range | Critical Values | Units |
|---|---|---|---|---|---|
| PHYT | ALL | 0 Minutes – 150 Years | 10 - 20 | > 30 | ug/mL |
Collection Instructions
- Steady state: approximately 1-5 weeks (highly variable).
- Trough: draw immediately prior to next oral dose.
Draw first specimen one week after starting therapy and 2nd specimen 3-5 weeks later.
Draw specimen within 2-4 hours after IV loading dose
Specimen Stability
7 days at 2-8°C
Day(s) Performed
Monday - Sunday
LOINC
3968-5
CPT
80185