Laboratory Test Information Guide

Details for Phenytoin,Serum/Plasma-Total

Test Name: Phenytoin,Serum/Plasma-Total
Alternate Name(s): Anticonvulsant
Dilantin
Laboratory: Core
Specimen Type: 4.5 mL Green (Lithium Heparin) top Vacutainer tube

Pediatric:
0-2 yrs: Green 0.5pk.
2-10 yrs: 2 mL Green top
Collection Information: Collect blood aseptically in a Vacutainer tube.

Serum from a 5 mL Gold top or 6 mL Red top Vacutainer tube is also acceptable.
Requisition: GENERAL LABORATORY REQUISITION
Test Schedule: As required
Turnaround time from when specimen
is received in testing laboratory:
 
Routine
24 hours
Stat
1 hour
 
Reference Range: Adult:
40-79 µmol/L

< 3 months:
24-55 µmol/L
Effective Date: 2008-11-15
Revised Date: 2014-02-25
Critical Value: Toxic: ≥120 µmol/L
Interpretive Comments: Note: Falsely elevated Phenytoin concentrations have been observed in patients with renal failure due to assay interference with metabolites of Phenytoin.
Special Processing:  
Comments: CRITICAL VALUE to be phoned to Nurse or Physician immediately:
Method of Analysis: Enzyme immunoassay (EIA)
Critical Information Required:  
Storage & Shipment:  
System Codes: 
Cerner
PHENY
 
Referred To:  

Questions? Comments? Contact Laura Gopaul