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Test Code FLUORIDE Fluoride, Plasma

Reporting Name

Fluoride, P

Useful For

Assessing accidental fluoride ingestion


Monitoring patients receiving sodium fluoride for bone disease or patients receiving voriconazole therapy

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Plasma Heparin

Specimen Required

Collection Container/Tube: Green top (sodium heparin)

Submission Container/Tube: Plastic vial

Specimen Volume: 3 mL

Specimen Minimum Volume

1.2 mL

Seattle Children's Hospital Note:

Collect 3 - 4 mL whole blood in a Heparin/Green top. Spin down and aliquot plasma.

Specimen Stability Information

Specimen Type Temperature Time
Plasma Heparin Refrigerated (preferred) 14 days
  Ambient  14 days
  Frozen  14 days

Reference Values

0.0-4.0 mcmol/L

Day(s) and Time(s) Performed

Tuesday; 8 a.m.

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FL Fluoride, P In Process


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 Electrodes, Cambridge, MA, Orion Research)

Reject Due To


Mild OK; Gross OK


Mild OK; Gross OK


Mild OK; Gross Reject



Method Name

Ion-Selective Electrode (ISE)