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Test Code T3FREE Free Triodothyronine Level (FT3)

Important Note

The results of this assay can be falsely elevated due to the consumption of Biotin.  Please instruct patients to discontinue the use of vitamins or supplements that contain Biotin 12hrs before blood draw.

Performing Location

Southwestern Vermont Medical Center

Specimen Collection Information

Specimen  Min. Test Volume Collection Container Special Handling
Blood 0.1 mL Light Green (lith. heparin) top
Gold top
Marble Red top		  

Reference Ranges & Critical Values

Assay Gender Age Range Normal Range Critical Values Units
T3FREE ALL 0 Minutes – 150 Years 2.0 - 4.4   pg/mL

Specimen Stability

7 days at 2-8°C

Day(s) Performed

Monday - Sunday

LOINC

3051-0

CPT(s)

84481