Test Code PHENO Phenobarbital LAB30
Test Method
Turbidimetric Inhibition Immunoassay; Beckman DXC600
Performance
Testing is performed Monday through Sunday.
Routine: Typically completed within 4 hours after the
specimen arrives at the testing site.
Expedite: Typically completed within 1 hour after the
specimen arrives at the testing site.
STAT: Typically completed within 30 minutes after the
specimen
arrives at the testing site.
Useful For
Monitoring for appropriate therapeutic concentration
Assessing compliance or toxicity
Specimen Requirement
0.5 mL serum or plasma is required.
CPT Code Information
80184 Therapeutic Drug Levels: Phenobarbital
Reference Values
10.0-40.0 mcg/mL
-
Toxic Level: > 60 mcg/mL
LOINC Code Information
3948-7 Phenobarbital [Mass/Volume] In Serum Or Plasma
Additional Specimen Collection Information
Collect blood in a lithium heparin, green-top or
red-top tube. Serum and plasma gel tubes are not
acceptable.Peak
levels should be collected between 6-18 hours after last
dose.
Serum or plasma should be separated from contact with the cells
within 2 hours of collection. Specimens not centrifuged within
4
hours of collection may be rejected. Refrigerate the
specimen
if unable to assay within 8 hours of collection. Samples with
>4+ lipemia must be cleared prior to analysis.