Children's Mercy Hospitals and Clinics
Name
Phenytoin, Free

Synonyms
Free Dilantin

CMH Lab Section
Toxicology/TDM

Specimen Requirements
2 ml of blood in a red or green top tube, no gel

Availability
Routine
Batched testing run Monday, Wednesday and Friday
Specimens must be in the lab by 0700 on testing day to be included in run

Turn Around Time
24-72 hours

Methodology
Liquid Chromatography Tandem Mass Spectrometry (LC MS/MS)

Ranges
Therapeutic: 1-2 mcg/mL
Toxic: >5 mcg/mL

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