Inactivated/Replace Test
Effective Date
08/19/2024
Included in Report
Replacement Test
Inactivated/Replace Test
Inactivated Test Details
Mnemonic
5FL
Ordering Code
3502845
CPT-4 Codes(s)
80299
Replacement Test Details
Mnemonic
FLUC
Ordering Code
3800384
CPT-4 Codes(s)
80299
Turnaround Time
5 - 10 days
Performed
Tuesday, Thursday
Legacy Code
FLUC
Example Report
Specimen Information
Patient Preparation
Serum for a peak level should be collected 1 to 2 hours after oral dose or 30 minutes after intravenous infusion. Trough specimens should be collected immediately prior to next scheduled dose.
Collect
Red top
Specimen Preparation
Centrifuge, separate cells from serum within 2 hours of collection and send 0.5 mL serum in a screw capped plastic vial.
Alternate Specimen
Serum separator tube (SST)
Minimum Volume
0.3 mL
Transport Temperature
Refrigerated
Rejection Criteria
Plasma, whole blood, urine
Stability
Room temperature: 28 days
Refrigerated: 28 days
Frozen: 28 days
Refrigerated: 28 days
Frozen: 28 days
Methodology
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
Reference Range
Therapeutic concentration: Peak >25.0 mcg/mL
(difficult infections may require higher concentrations)
Toxic concentration: Peak >100.0 mcg/mL
(difficult infections may require higher concentrations)
Toxic concentration: Peak >100.0 mcg/mL
Performing Laboratory
Mayo Clinic Laboratories
New York DOH Approval Status
Yes