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Phenytoin, Free (Dilantin, Free)


No Gel in Red Top Bullet

Tube Type

Test ID   LAB32
EPIC Order
CPT Code(s)   80186
Group/Individual Test   Individual
Laboratory   Core Laboratory
Tube Station Routine 30
  STAT 888
Specimen Routine: 7mL blood/royal blue top tube ONLY; see Comments for additional information
micro: 600 µL blood/red top pediatric bullet; see Comments for additional  information
Unspun - 4 hrs
Spun and Separated Room Temp - 8 hrs
Spun and Separated Refrigerated - 1 week
Spun and Separated Frozen - 1 week
Availability Routine: 1 run daily/7 days; Sample must be received in the Core Laboratory by 12PM for same-day testing
Turnaround Time   Resulted by 4pm.
Reference Range Therapeutic: 1-2 mcg/mL (trough, steady state)
  Toxic: >2.5 mcg/mL
Comments Collection information: Red Top Pediatric Tubes must NOT contain Serum Separator Gel.

Reviewed by D. Burton on December 16, 2019

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