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HelpTest Code Phenytoin Phenytoin
Performing Laboratory
| General Hospital Laboratory | 304-388-6244 |
| Teays Valley Hospital Laboratory | 304-757-1770 |
| Greenbrier Valley Laboratory | 304-647-6060 |
Specimen Requirements
Preferred: Plasma-Dark Green Lithium Heparin or Serum- red top
Acceptable: Plasma-Mint Green or Serum-SST gold top
Allow SST or red top to completely clot
Spin and physically separate plasma/serum from contact with cells as soon as possible
4 mL of plasma/serum (minimum 2 mL)
Specimen Rejection
- Improperly labeled, collected, stored, and transported
- Quantity not sufficient
Storage and Stability
| Room temperature | 8 hrs |
| Refrigerated 2-8oC | 1 month |
| Frozen <-20oC | 3 months |
Reference Values
10.0-20.0 mcg/mL
Critical Value >30.0 mcg/mL
Methodology
| Homogeneous Enymatic immunoassy | General, Teays |
| Multi-Point Immuno Rate | Greenbrier |
Days Test Set Up and Turnaround
Monday through Sunday, Continuously
| AM Collection | Expected by 9AM same day |
| Routine | Expected within 24 hrs |
| Stat | Expected within 1 hr |
| Timed | Expected results are test dependant |
CPT Coding
80185