Test Overview
Test Methodology

Liquid Chromatography - Tandem Mass Spectrometry (LC-MS/MS)

Test Usage

Monitor therapeutic drug level.

Reference Range *

5 - 20 mcg/mL; Critical >25 mcg/mL

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

Test Details
Days Set Up
Daily
Analytic Time

4 hours

Soft Order Code
CAF
MiChart Code
Caffeine Level
Synonyms
    Laboratory
    Chemical Pathology
    Section
    Drug Analysis
    Specimen Requirements
    Collection Instructions

    Collect specimen in a red, green (heparin), or lavender (EDTA) top tube; do not use SST tube. Centrifuge, aliquot serum or plasma into a plastic vial and refrigerate.

    Normal Volume
    0.5 mL serum or plasma
    Minimum Volume
    0.15 mL serum or plasma
    Rejection Criteria
    SST tube not acceptable.
    Billing
    CPT Code
    80155
    Fee Code
    33218
    LOINC
    3422-3
    NY State Approved
    No