Test Overview
Test Methodology

LCMS

Test Usage

Monitor therapeutic drug level.

Reference Range *

5 - 20 mcg/mL; Toxic > 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
  • CAF
  • CAFFEINE
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.

Rejection Criteria
SST tube not acceptable.
Yellow Top Tube
Red Top Tube
Normal Volume
0.5 mL serum or plasma
Minimum Volume
0.3 mL serum or plasma
Billing
CPT Code
80155
Fee Code
33218
LOINC
3422-3
Resources