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Phenobarbital

Source Blood
Mnemonic PHENO
Specimen Requirements

1 x 3 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 dose.

Specimen Handling

Additional Information

Record time of last dose on requisition. 

Time to steady state: adults 10-25 days, children 8-15 days.
It is important for comparative measurement that sampling time be consistent.

Testing Location Chemistry-ACH
Testing Frequency Daily
Alternate Name(s) Meberal, Nembutal
Reference Interval

Therapeutic range: 65 - 170 umol/L

Click here for critical values.