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.

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]
Rejection Criteria
SST tube not acceptable.
Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.3 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

CPT Code
Fee Code