Test Overview
Test Methodology

Kinetic Immunoassay (KIMS).

Test Usage

Evaluate phenytoin toxicity

Reference Range *

1-2 mcg/mL (Approximately 10% of the total drug concentration). Toxic levels: greater than 3 mcg/mL.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Daily, 24 hrs.
Analytic Time

2 hours

Soft Order Code
FDIL
MiChart Code
Phenytoin Level, Free
Synonyms
  • Dilantin, Protein Free
  • Free Dilantin
  • Free Phenytoin
Laboratory
Chemical Pathology
Section
Automation
Specimen Requirements
Collection Instructions

Collect blood in a red top tube; do not use SST tube. Centrifuge, aliquot serum into a plastic vial, and refrigerate.

Alternate Specimen
Green top (heparin).
Normal Volume
1 mL serum
Minimum Volume
0.75 mL serum
Rejection Criteria
SST tube not acceptable.
Billing
CPT Code
80186
Fee Code
33190
LOINC
3969-3
NY State Approved
No