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Test Code Phenobarb Phenobarbital

Important Note

The concentration of phenobarbital in serum/plasma depends on the time of the last drug dose; mode of administration; concomitant drug therapy; time of sample collection; and individual variations in absorbtion, distrubtion, biotransformation and excretion.  These parameters must be considered when interpreting results.

Performing Laboratory

General Hospital Laboratory             304-388-6244           

Specimen Requirements

Preferred:

Plasma-Dark Green Lithium Heparin or Serum- red top

Acceptable:

Plasma-Mint Green or Serum-SST gold top

Allow SST or red top to completely clot      

Spin and physically separate plasma/serum from contact with cells as soon as possible

4 mL of plasma/serum (minimum 2 mL)

Specimen Rejection

  • Improperly labeled, collected, stored, and transported
  • Quantity not sufficient

Storage and Stability

Room temperature 8 hrs
Refrigerated 2-8oC 1 month
Frozen <-20oC 3 months

Reference Values

15.0-40.0 mcg/mL

Critical Value > 50.0 mcg/mL

Methodology

Homogeneous enymatic immunoassy

Days Test Set Up and Turnaround

Monday through Sunday, Continuously 

AM Collection Expected by 9AM same day
Routine Expected within 24 hrs
Stat Expected within 1 hr
Timed Expected results are test dependant

CPT Coding

80184