Update Type: Replacement Test
Test Updated: 05/05/2021
Test Overview
Test Methodology

Liquid chromatography/Tandem Mass Spectrometry (LC/MS/MS)

Test Usage

Therapeutic Drug Monitoring

Reference Range *

5 - 20 ng/ml

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Tuesday and Thursday
Analytic Time

6 - 14 days

Soft Order Code
Reference Laboratory
Mayo RIT (80456) (MedTox 79)
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in a red top or green top tube; do not use SST or PST tube. Centrifuge, aliquot serum or plasma into a plastic vial and freeze within 6 hours of collection.

Alternate Specimen
Heparinized plasma (green top) is acceptable. [3/02]
Normal Volume
2 mL serum or plasma
Minimum Volume
0.5 mL serum or plasma
Rejection Criteria
SST or PST tube not acceptable.
Additional Information

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

CPT Code