Item Value
Test name Phenobarbital
Available Stat? Yes
Turn around times STAT 1 hour, Routine 4 hours
In House Availability Test available 24 hours per day 7 days per week
Performed by Parnassus & Mission Bay Chemistry
Normal range Therapeutic levels:
0-17 years 15-40 mg/L
≥ 18 years 10-40 mg/L


Therapeutic ranges adopted or modified from the literature based on recommendations of UCSF Pharmacists
Container type Gold top or Light Green top
Amount to Collect 1 mL blood
Collection Instructions Time to steady state: 2-4 weeks

Collect sample before next dose.

Indicate time of draw on requisition.
Sample type Serum or plasma

If you have additional questions regarding this test, please call: 415-353-1667