Test Overview
Test Methodology
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
Test Usage
Monitoring for optimal therapeutic concentrations or patient compliance.
Reference Range *
800 – 1600 ng/mL
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Test Details
Analytic Time
5 - 9 days
Soft Order Code
FFTRZ
Laboratory
Sendout
Reference Laboratory
Mayo FFTRZ (MedTox 124)
Section
Special Testing
Specimen Requirements
Collection Instructions
Collect specimen in a red top tube; do not use SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate.
Alternate Specimen
Heparinized plasma is acceptable. [4/16]
Normal Volume
1 mL serum
Minimum Volume
0.6 mL serum
Rejection Criteria
SST tube not acceptable.
Additional Information
Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.
Billing
CPT Code
80338
Fee Code
AA204
LOINC
4064-2