Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS).
Monitoring of fentanyl therapy.
3 - 8 days
- Fentanyl and Metabolite, Serum
Collect specimen in red top tube; do not use SST tube. Centrifuge, aliquot serum into a plastic vial and freeze within 2 hours of collection.
Test sent to Mayo Clinic Laboratories.