PHENYTOIN

Test Documentation
Specimen Required
Draw blood in a plain red-top tube. Centrifuge, separate and send 1.0 mL serum (0.2 mL minimum) refrigerated in a screw-capped plastic vial.

Rejection Criteria
SST

Methodology
High Performance Liquid Chromatography

Stability
Room Temperature: 48 hours; Refrigerated: 14 days; Frozen: 14 days

Reference Range
Therapeutic: 10–20 µg/mL
Toxic: >30 µg/mL

Performed
Monday-Friday

Turnaround Time1-3 days
Test CodePHENY
CPT-4 Code (s)
80185
LOINC Codes
3968-5

Warde
Medical
Laboratory