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Laboratory Medicine

Test catalogue

Phenytoin, Free (Free Dilantan )

Test Name

Phenytoin, Free (Free Dilantan )

Red Tube with thin top Specimen Type/Requirements

Container Type = 1 Red Top

Minimum Volume = 3 mL Blood

Tube must fill to at least ½ or greater of its vacuum capacity

Specimen Handling

Collection Instructions: Ensure both sample and requisition are labelled properly. Collect Trough level 0-30 minutes prior to dose. Write your initials, date and time of collection on the collection label or requisition.

Special Instructions: Separate samples from cells as soon as possible. Repeated freezing and thawing of samples should be avoided

Rejection Criteria: Unlabeled or Not Sufficient Quantity samples will be rejected.

Stability: Stable for 4 hours at room temperature, at 2-8°C for 4 days and frozen for 1 month.

Transportation: Send sample to core lab as soon as possible.

Required Documentation

Turnaround Time (TAT)

1 hour for Trauma/Stat

2 hours for routine

Test Utilization

Reference Value

4.0 - 8.0 umol/L

Test Code




Testing Location

Referred Out – ON, Canada (ROSK01)

Other Information

Last Updated: June 06, 2019