Phenytoin (Dilantin)

No Gel in Red Top Bullet

Tube Type

Test ID   LAB31
EPIC Order
  PHENYTOIN LEVEL, TOTAL
CPT Code(s)   80185
Group/Individual Test   Individual
Laboratory   Core Laboratory
Tube Station   Routine: 30; STAT: 888
Specimen Routine: 3 mL blood/royal blue top tube or plain red top tube (no gel); see Comments for additional information
  micro: 300 µL blood/red top pediatric bullet; see Comments for additional information
Stability
Unspun - 4 hrs
Spun and Separated Room Temp - 24 hrs
Spun and Separated Refrigerated - 2 days
Spun and Separated Frozen - 5 months
Availability 24 hrs/day
Turnaround Time   STAT: 1 hr; Routine: 2 hrs
Reference Range Therapeutic: 10-20 mcg/mL (Trough, Steady state)
  Toxic: >30 mcg/mL
Comments Red top tubes must NOT contain Serum Separator Gel
Collection information: For oral dose, collect as trough immediately before next dose.

Reviewed by jcayless on January 06, 2022

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514