Posted Date
Effective Date
Test Name
Butalbital, Serum
Update Type
Reference range changed
CPT Code
80345
Order Code
BBT
REFERENCE RANGE CHANGE
Butalbital, Serum
Order Code: BBT
Fee Code: AA214 (CPT 80345)
Reference Laboratory: Mayo BUTAS
The reference range for Mayo Clinic Laboratories Butalbital, Serum assay will be updated to add clarifying language effective July 24, 2024.
Reference Range: Peak concentrations (100 mg single oral dose): 1.7 – 2.6 mcg/mL at 2 hours; 1.3 – 1.7 mcg/mL at 24 hours. Toxic concentration: >or= 10 mcg/mL. Cutoff level: 0.5 ng/mL.