Days Set Up
Daily, 24 hours
Analytic Time

4 hours

MiChart Code
T3
Soft Order Code
T3

Test Updated:

Synonyms

Synthroid (Levothyroxine)
Triiodothyronine
T3
T3 TOTAL

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All specimens should be accompanied by a requisition.

Submitting Specimens

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MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

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Test Overview

Test Methodology

Chemiluminescent Immunoassay

Test Usage

Thyroid function test, particularly useful in the diagnosis of T3 thyrotoxicosis and confirmation of hyperthyroidism. Needed in patients with clinical evidence for hyperthyroidism, in whom thyroid profile is normal or borderline.

Reference Range

80 - 175 ng/dL

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect specimen in a red top or SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate up to 48 hours or freeze for longer storage.

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.25 mL serum

Billing Information

CPT Code
84480
Pro Fee Code
 
LOINC
3053-6

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.

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