PHENYTOIN, FREE

Test Documentation
Specimen Required
Draw blood in a plain red-top tube. Centrifuge, separate and send 3 mL serum (0.5 mL minimum) refrigerated in a screw-capped plastic vial.

Rejection Criteria
SST

Methodology
Homogeneous Enzyme Immunoassay

Stability
Room Temperature: Unacceptable; Refrigerated: 14 days; Frozen: 14 days

Reference Range
Therapeutic: 1.0-2.0 µg/mL
Toxic: >3.0 µg/mL

Performed
Sunday-Friday

Turnaround Time1 day
Test CodePHNYF
CPT-4 Code (s)
80186
LOINC Codes
3969-3

Warde
Medical
Laboratory