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]
Rejection Criteria
SST tube not acceptable.
Yellow Top Tube
Red Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.6 mL serum
Additional Information

Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.

Billing
CPT Code
80338
Fee Code
AA204
LOINC
4064-2
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