Test ID: FRTIX
Free Thyroxine Index (FTI), Serum
Back to Pediatric Index | Back to list | More information
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
External
link
PDF
document
Excel
document
Word
document