Employee Login  |   Subscribe  |   Careers  |   Appointments
List All Test Names Beginning With:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Phenytoin

Source Blood
Mnemonic PTN
Specimen Requirements 1 x 3 mL or 4.5 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

0.2 mL plasma or serum

Minimum Whole Blood Volumes for Microcollections 

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, FMC, PLC, RGH, SHC
Rural: HRH, SDHS
Testing Frequency Daily
Alternate Name(s) Dilantin
Reference Interval

Therapeutic range

Less than 4 months

25 – 55 umol/L

4 months – 150 years

40 - 80 umol/L

Click here for critical values.