7 - 12 days
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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.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect trough specimen in a green top or red top tube. Centrifuge, aliquot plasma or serum into a plastic vial and refrigerate.