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HelpTest Code Pheny Grp Phenytoin, Free And Total
Clinical System Name
Phenytoin, Free And Total
Synonyms
Dilantin, Free And Total
Sample Requirements
Specimen: Whole Blood
Container(s): Red or Gold SST or Dark Green/Sodium Heparin
Preferred Vol: 2 mL
Minimum Vol:
Note: Draw just prior to next dose. Avoid hemolysis.
Indicate on requisition that total is to be done at CHRMC Lab if result of Total Phenytoin is needed stat.
Processing Instructions
Reject due to:
Spin: Y
Aliquot: Y
Temp: -20 C
Storage location: CPA freezer.
Order a PHENYTOIN and a PHENY GRP if requisition indicates total is to be run at CHRMC Lab stat.
Off-site collection:
Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum or plasma | Room temp | N |
| Refrigerated | 24 h | |
| Frozen | Y |
Availability
| STAT | Performed | TAT |
|---|---|---|
| N | Daily | 1 - 3 d |
Performing Laboratory
Harborview Medical Center
Department
Department:
Harborview Medical Center
Room GWH47; 325 9th Ave
Seattle, WA 98104
Phone Number: (206) 744-3451
CPT Codes
80185
Methodology
Method: EMIT
Analytical Volume: 0.5 mL serum or plasma
Limitations:
Reference Range
| Free Phenytoin | Total Phenytoin | |
| Therapuetic | 1.00 - 2.00 uG/mL | 10 - 20 uG/mL |
| Toxic | >25 uG/mL |
Free/Total ratio: 8 - 14%
Send Out Instructions
| Reference Test Name: | Phenytoin - Free and Total |
| Reference Test Number: | FTDIL |
| Instructions: | Send out Monday thru Friday with the UW/HMC courier. Keep a copy of the Batch Sheet for our records. |