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Test ID: FRTIX
Free Thyroxine Index (FTI), Serum

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Secondary ID A test code used for billing and in test definitions created prior to November 2011

80315

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.

T-UPTAKE

Males: 27-37%

Females: 20-37%

 

FREE THYROXINE INDEX

Males

<1.5 suggest hypothyroidism

1.5-3.0 suggest euthyroidism

>3.0 suggest hyperthyroidism

Females

<1.3 suggest hypothyroidism

1.3-3.0 suggest euthyroidism

>3.0 suggest hyperthyroidism

 

THYROXINE, TOTAL

Males

0-11 months: not established

1-9 years: 6.0-12.5 mcg/dL

10-23 years: 5.0-11.0 mcg/dL

> or =24 years: 5.0-12.5 mcg/dL

Females

0-11 months: not established

1-9 years: 6.0-12.5 mcg/dL

10-17 years: 5.0-11.0 mcg/dL

> or =18 years: 5.0-12.5 mcg/dL



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