What is FTI blood test?
The free T4 index (FTI) is a blood test used to diagnose thyroid disorders. T4, also called thyroxine, is a thyroid hormone. The test measures how much of it is in your blood to help determine whether your thyroid gland is underactive (hypothyroidism) or overactive (hyperthyroidism).
Is 4.1 TSH high?
A normal TSH value is under 4.0 milli-international units per liter (mIU/L). When the TSH level is above 10 mIU/L, there’s uniform agreement that treatment with levothyroxine is appropriate.
What does THBR mean?
Thyroid hormone binding ratio (THBR) is a Thyroid Function Test that measures the “uptake” of T3 or T4 tracer by Thyroid Binding Globulin (TBG) in a given serum sample.
What are the results of the FTI blood test?
The FTI blood test uses a mathematical computation to estimate results from T3 and T4 uptake tests. The information lets doctors estimate how much free hormones produced by the thyroid are available in the blood for the body to use.
What does FTI stand for in medical terms?
FTI = Thyroxine (T4)/Thyroid Binding Capacity. The FTI is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins. Hyperthyroidism causes increased FTI and hypothyroidism causes decreased values.
What causes an increase in the FTI level?
The FTI is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins. Hyperthyroidism causes increased FTI and hypothyroidism causes decreased values. 1.
How is the free thyroxine index ( FTI ) calculated?
The free thyroxine index (FTI) is determined by the following calculation: FTI = Thyroxine (T4)/Thyroid Binding Capacity. The FTI is a normalized determination that remains relatively constant in healthy individuals and compensates for abnormal levels of binding proteins.
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