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Test Code LAB30 Phenobarbital

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center

Specimen Minimum Volume

0.5 mL

Billing Code

2050995

Methodology

Particle Enhanced Turbidimetric Inhibition Immunoassay 

Specimen Requirements

RRMC:  

Yellow (Gold) top tube (SST)  

Lithium Heparin Green top tube

 

Outpatient clients must draw SST

 

TRMC:  

Plain Red top tube   No SST or PST

 

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

Performing Department

Chemistry

Day(s) Test Set Up

Routine – same day

ASAP – 2 hours after receipt of specimen in lab

STAT – 1 hour after receipt of specimen in lab

Test Classification and CPT Coding

80184  -  Phenobarbital

Additional Information

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.

Specimen Transport Temperature and Stability

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

Reasons for Rejection

Icterus

Lipemia

Hemolysis

Quantity not sufficient (QNS)

Lack of Two Patient Identifiers:

         1-Patient's First & Last name 

         2-Patient's Date of Birth