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Test Code FT3 T3 Free

Important Note

Medicare frequency limitations exist for this test in addition to diagnosis requirements. Click on link for list of medically necessary diagnoses: http://www.munsonhealthcare.org/medical-necessity. Click on link for Advance Beneficiary Notice of Noncoverage form: Advance Beneficiary Notice of Noncoverage

EHR Test Codes

  Test Code Test Name
Atlas FT3 T3(Triiodothyronine) Free, Serum
Cerner FT3 T3 Free

Specimen Requirements

Preparation of Patient: 

None

 

Container Type: 

Gold Top 6mL SST Gel & Clot Activator Tube

Specimen Type:

Serum

 

Specimen Volume: 

2.5 mL Serum minimum .5 mL

 

Specimen Handling/Transport:

Separate serum from cells within 2 hours of collection.

Transport ambient, refrigerated or frozen.

 

Specimen Stability/Storage:

8 hours ambient room temperature

2 days refrigerated 2-8°C

>2 days frozen -20°C

Performing Laboratory

Munson Medical Center Laboratories

Chemistry Department

Priority, Frequency, & Turnaround

Priority:

Non-Emergent

 

Frequency:

24 hours 7 days a week

 

Turnaround:

0 - 1 days

Methodology

Chemiluminescence Immunoassay

Reporting

Reference Range:

2.3 - 4.2 pg/mL

 

Interpretive Data:
Biotin supplements may falsely increase this analyte.

 

Critical Decision:

None

Clinical Significance

FT3 is the active form of triiodothyronine. FT3 is used to provide further confirmation of hyperthyroidism, supplementing the T4,TSHS and TT3 assays. It is also useful in evaluating clinically euthyroid patients who have an altered distribution of binding proteins and in monitoring thyroid hormone replacement therapy. Elevated FT3 values are associated with thyrotoxicosis or excess thyroid hormone replacement.

CPT Code(s)

84481