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Test Name

T4 Free (FT4)

To view specimen requirements and codes please Select a regional laboratory.

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CPT Code(s)**

84439
**IMPORTANT: CPT Code is informational only; obtain the Test Code for ordering.

Methodology

Immunoassay (IA)

Reference Range(s)

<1 Month Not established
1-23 Months 0.9-1.4 ng/dL
2-12 Years 0.9-1.4 ng/dL
13-20 Years 0.8-1.4 ng/dL
>20 Years 0.8-1.8 ng/dL

Clinical Significance

For diagnosis of hypothyroidism and hyperthyroidism.

Test FAQ

T4, Free

Alternative Name(s)

FT4

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

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T4 Free (FT4)
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