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HelpTest Code FL Fluoride, Plasma
Additional Codes
FLORIDE
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Reporting Name
Fluoride, PSpecimen Type
Plasma HeparinSpecimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube: Green top (sodium heparin)
Submission Container/Tube: Plastic vial
Specimen Volume: 3 mL Plasma
Collection Instructions: Centrifuge and aliquot plasma into a plastic vial. Glass tubes are not acceptable.
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | OK |
| Gross icterus | OK |
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma Heparin | Refrigerated (preferred) | 14 days |
| Ambient | 14 days | |
| Frozen | 14 days |
Specimen Minimum Volume
Plasma: 1.2 mL
Day(s) Performed
Tuesday
Specimen Retention Time
14 daysReport Available
2 to 8 daysReference Values
<4.1 mcmol/L
Useful For
Assessing accidental fluoride ingestion
Monitoring patients receiving sodium fluoride for bone disease or patients receiving voriconazole therapy
CPT Code Information
82735
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| FL | Fluoride, P | 14726-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 8641 | Fluoride, P | 14726-4 |
Method Description
The fluoride electrode consists of a single-crystal lanthanum fluoride membrane and an internal reference bonded into an epoxy body. The crystal is an ionic conductor in which only fluoride ions are mobile. When the membrane is in contact with a fluoride solution, potential develops across the membrane. This potential depends on the level of free fluoride ions in solution and is measured against an external constant reference potential with a digital pH/mV meter.(Instruction manual: Fluoride Ion Selective Electrode User Guide. Thermo Scientific; 09/2016)