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Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
4.0 - 40.0 ng/mL; critical value: 50.0 ng/mL. Low-dose therapeutic range: 1.0 - 2.25 ng/mL.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect a trough specimen in a red or green top tube; do not use SST tube. Centrifuge, aliquot serum or plasma into a plastic vial and refrigerate or freeze. Protect specimen from light.