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Test ID: FRDIL/TDIL

Phenytoin – Free and Total, Serum

Test Overview

Method

High Performance Liquid Chromatography (HPLC)

Result Included

Phenytoin Free; Phenytoin Total

Aliases/Synonyms

Dilantin

Specimen

Specimen Type

Avoid gel separator tubes
Serum

Volume

Sample Volume

1 mL

Specimen Comment

Avoid gel separator tubes.

Stability

Refrigerated	Frozen
1 month	6 months

Performance & Interpretation

Turnaround Time

2 days

Results

Phenytoin - Free

µmol/L

Therapeutic: 4.0 - 8.0

Toxic: >8.0

mg/L x 3.96
Phenytoin - Total

µmol/L

Therapeutic: 40 - 80

Toxic: >80

mg/L x 3.96

Referral Location

Canada

Test Version

Last Updated

2019-09-30