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Test Code TSHR Thyroid Stimulating Hormone with Reflex to Free T4 and Free T3

Important Note

The results of this assay can be falsely lowered due to the consumption of Biotin.  Please instruct patients to discontiue 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
TSH ALL 0 Minutes – 150 Years 0.27 - 4.20 > 100 uIU/mL
T4FREE ALL 0 Minutes – 150 Years 0.9 - 1.7   ng/dL
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

 3016-3 - TSH

(3024-7 - T4 Free reflex)

(3051-0 - T3 Free reflex)

CPT

84443 - TSH

+ reflex Free T4 - 84439 as appropriate

+ reflex T3 Free - 84481 as appropriate