Test Overview

Test Methodology

Quantitative Liquid Chromatography-Tandem Mass Spectrometry

Test Usage

Useful for monitoring compliance and assessing toxicity in overdose situations.

Reference Range*

ADULT: Therapeutic: 50 - 300 ng/mL; Toxic: > 750 ng/mL. CHILD (0 - 11 yrs): Therapeutic: 30 - 80 ng/mL; Toxic > 200 ng/mL.

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

Test Details

Days Test Performed

Wednesday, Saturday

Analytic Time

3 days

Soft Order Code

SO

Synonyms

Laboratory

Sendout

Laboratory Reference

Warde CHLPR (ARUP 0090870)

Looking to Order a Test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Specimen Requirements

Offsite Collection Instructions

Collect blood in a red top tube; do not use SST tube. Centrifuge, aliquot serum into plastic vial within 2 hours of collection, and refrigerate.

Rejection Criteria

SST tube not acceptable.

Container

Normal Volume

2 mL serum

Minimum Volume

1 mL serum

Additional Information

Test sent to Warde Medical Laboratory; performed by ARUP Laboratories.

Billing Information

Fee Codes

CPT Code

80342

LOINC

3471-0

Have More Billing Questions?

Explore our helpful billing resources:

Billing Resources

Billing FAQ