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Test Code LAB30 Phenobarbital

Useful For

Monitor therapeutic drug level of phenobarbital. Phenobarbital is designed to induce prompt and prolonged central nervous system sedation.  It is occasionally combined with other drugs such as phenytoin, carbamazepine or valproic acid.  When used in conjunction with valproic acid, excretion diminished due to urine acidification by valproic acid.  Thus, toxic concentrations of phenobarbital may be encountered in a patient previously doing well on phenobarbital alone if valproic acid is added to the drug regimen.

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center

 

Performing Department

Chemistry

Specimen Required

RRMC:  

(submit one of the following tube types)

Yellow (Gold) top tube (SST)  -Outpatient clients MUST draw SST

Lithium Heparin Green top tube

Green top microtainer

 

TRMC:  

Plain Red top tube   No SST or PST

 

Collect just prior to next dose, please provide last dose information

Specimen Minimum Volume

0.5 mL

Neonatal minimum volume: 0.4 mL whole blood

Specimen Stability Information

Centrifuge and refrigerate within 2 hours of collection

Primary tube: Spun SST stable 24 hours at  2° to 8° C

Serum stable 48 hours if aliquoted and refrigerated at 2° to 8° C

Reject Due To

  • Icterus
  • Lipemia
  • Hemolysis
  • Quantity not sufficient (QNS)
  • Lack of Two Patient Identifiers:
    • 1-Patient's First & Last name 
    • 2-Patient's Date of Birth

Day(s) Performed

Turnaround time:

Routine – 4 hour after receipt of specimen in lab

STAT - 1 hour after receipt of specimen in lab

Method Name

Particle Enhanced Turbidimetric Inhibition Immunoassay 

CPT Code Information

80184  -  Phenobarbital

Billing Code

2050995