Test ID: T4TF
T4 (Thyroxine), Total and Free
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Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
8684
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.
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