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Phenytoin

Source Blood
Mnemonic PTN
Specimen Requirements 1 x 3 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

Minimum Whole Blood Volumes for Micro-Collections using Microtainers 

Collect specimen 0-60 minutes prior to next oral dose or greater than 2 hours post IV dose.
Specimen Handling
Additional Information

Record time of last medication on requisition.

For additional information, see Half-life and Time to Steady State.

Testing Location Chemistry-ACH, DSC, FMC, PLC & RGH
Testing Frequency Daily
Alternate Name(s) Dilantin
Reference Interval Therapeutic range

 

0 – 3 months

25 – 55 mmol/L

4 months – 150 years

40 - 80 mmol/L

 

 

Click here for critical values.