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Laboratory Medicine

Test catalogue

Phenytoin (Dilantin)

Test Name

Phenytoin (Dilantin)

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: Serum collected in red top vacutainer (without gel separator). The sample is collected before administration of the next dose or must be collected at the same time in relation to the dose administration to obtain comparable results. 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: Gel separator, grossly hemolyzed and icteric samples, 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 and 2 hours for routine

Test Utilization

Reference Value

Therapeutic: 0 – 2 months: 24 – 55 umol/L

3 months and older : 40 – 80 umol/L

Toxic > 80 umol/L

Test Code



KIMS Immunoassay

Testing Location


Other Information

Last Updated: September 26, 2019