Test Overview
Test Methodology

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

Test Usage

Determining the level of antimicrobial in serum from treated patients.

Reference Range *

Peak: >25 mcg/mL, Toxic: >100 mcg/mL.

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

Test Details
Days Set Up
Tuesday, Thursday
Analytic Time

3 - 9 days

Soft Order Code
MiChart Code
5-Flucytosine Level
  • 5-Fluorocytosine
  • Flucytosine
  • Ancoban
  • 5-Flucytosine
  • Fluorocytosine
  • 5-FC
Reference Laboratory
Mayo FLUC (82741)
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in a red top or SST tube. Centrifuge, aliquot serum into a plastic vial within 2 hours of collection and refrigerate (preferred). Serum for a peak level should be drawn 30 minutes after completion of infusion of an intravenous dose or 1 - 2 hours after an oral dose; trough specimens should be drawn immediately prior to next scheduled dose.

Alternate Specimen
CSF is an acceptable specimen. [4/02]
Normal Volume
0.5 mL serum
Minimum Volume
0.3 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

CPT Code
Fee Code