Posted Date
Effective Date
Test Name Fentanyl, Serum
Update Type Reference range changed
CPT Code 80354
Order Code FENTS

Order Code:                  FENTS

Fee Code:                     21581 (CPT 80354)

Reference Laboratory:   Mayo FENTS

 

The following clarifying language and cut off values will be added to the reference range for Mayo Clinic Laboratories Fentanyl, Serum assay effective May 27, 2025:

 

Reference Range:

 

Fentanyl:

Average serum fentanyl concentrations 24 hours after application of transdermal patch:

25 mcg/hour: 0.3-1.2 ng/mL

50 mcg/hour: 0.6-1.8 ng/mL

75 mcg/hour: 1.1-2.6 ng/mL

100 mcg/hour: 1.9-3.8 ng/mL

(Baselt RC. Disposition of Toxic Drugs and Chemical in Man. 12th ed. Biomedical Publications; 2020)

 

Norfentanyl:

Reference range: Not established

 

Cutoff concentrations by liquid chromatography tandem mass spectrometry:

Fentanyl: 0.05 ng/mL

Norfentanyl: 0.25 ng/mL