1 x 5 mL light green (mint) top PST tube. Gold top SST tube is also acceptable.
RECORD time of last dose on requisition.
Phenobarbital, a metabolite of Primidone, is tested with all Primidone requests.
For additional information, see Half-life and time to Steady State.
Therapeutic range: 23.0 - 55.0 mmol/L
