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Test ID: T4TF    
T4 (Thyroxine), Total and Free

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Useful For Suggests clinical disorders or settings where the test may be helpful

See individual test descriptions for:

-T4 / T4 (Thyroxine), Total Only, Serum

-FRT4 / T4 (Thyroxine), Free, Serum

Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

See individual test descriptions for:

-T4 / T4 (Thyroxine), Total Only, Serum

-FRT4 / T4 (Thyroxine), Free, Serum

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

T4 (THYROXINE), TOTAL ONLY

> or =12 months: 5.0-12.5 mcg/dL

Reference values have not been established for patients that are <12 months of age.

 

T4 (THYROXINE), FREE

0.8-1.8 ng/dL

Elevated values are seen in patients on thyroxine therapy.

Interpretation Provides information to assist in interpretation of the test results

See individual test descriptions for:

-T4 / T4 (Thyroxine), Total Only, Serum

-FRT4 / T4 (Thyroxine), Free, Serum

Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

See individual test descriptions for:

-T4 / T4 (Thyroxine), Total Only, Serum

-FRT4 / T4 (Thyroxine), Free, Serum

Clinical Reference Provides recommendations for further in-depth reading of a clinical nature

See individual test descriptions for:

-T4 / T4 (Thyroxine), Total Only, Serum

-FRT4 / T4 (Thyroxine), Free, Serum