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HelpTest Code PHENY Phenytoin, Total, Plasma or Serum
Additional Codes
LAB31
Performing Laboratory
Central Peninsula Hospital
Important Notes
Phenytoin, Total, Plasma or Serum test is for medical use only.
Collection Method
Venipuncture
Container
Lt Green / Plasma Separator / Lithium Heparin
Specimen Type
Preferred
- Plasma- Light Green Top (Lithium heparin)
Acceptable
- Serum- Gold Top SST or Red Top
Minimum Volume
0.5ml
Specimen Stability
| Ambient | 4 days |
| Refrigerated (4°C to 8°C) | 4 days |
| Frozen(-40°C to 0°C) | 1 month |
Reference or Target Ranges
10-20 µg/mL
Peak: 4 -5 hours post oral dose
Trough: Just prior to next dose
Reportable Units
µg/mL
Critical Value
≥ 30 µg/mL
Reasons for Rejection
| Hemolysis Threshold | 1000 mg/dL |
| Icterus Threshold | 50 mg/dL |
| Lipemia Threshold | 800 mg/dL |
| Other | QNS, contaminated, improperly labeled, improper specimen type |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
STAT: 1 hour Routine: 4 hours |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
80186
Last review/edit date
2025