High Performance Liquid Chromatography with Fluorescence Detection
The expected serum concentration in patients on usual daily dosages is up to 5 mcg/mL. Toxic: >50 mcg/mL.
7 - 12 days
Collect trough specimen in a green top or red top tube (no SST or PST). Centrifuge, aliquot plasma or serum into a plastic vial and refrigerate.
Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.