Posted Date
Effective Date
Update Type New Tests
CPT Code 80299
Order Code BTBAS

NEW TEST

 

Butabarbital, Serum

Order Code:                  BTBAS

Fee Code:                     AB198 (CPT 80299)

Reference Laboratory:   Mayo BTBAS

 

Mayo Clinic Laboratories will begin offering Butabarbital, Serum by Gas Chromatography Mass Spectrometry (GC-MS) for use in monitoring of butabarbital therapy effective July 24, 2025. This test is currently forwarded to MedTox. 

 

Collection Instructions: Collect specimen in a red top tube. DO NOT USE SST TUBE. Centrifuge within 2 hours of specimen collection, aliquot 1.5 mL (minimum 0.6 mL) of serum into a plastic vial, and refrigerate.

 

Reference Range: Therapeutic range: 2.0 – 3.0 mcg/mL (hypnosis); 25 mcg/mL (sedation/sleep); >30 mcg/mL (coma). Toxic concentration: >50 mcg/mL. The concentration at which toxicity occurs varies, and results should be interpreted in light of the clinical situation. Cutoff level: 0.5 ng/mL.