A healthy result should fall into the range 1.2 - 4.3 Units.

The T7 Index is the product of T4 x T3 Uptake, divided by 100. it is also known as the Free Thyroxine Index.

T7= (T4 x T3-Uptake)/100

This calculation is an attempt to correct for variations in thyroxine binding proteins.

Result interpretation:

Disorder Total T4 T3 Uptake T7
Primary hypothyroid Decreased Decreased Decreased
Secondary hypothyroid Decreased Decreased Decreased
Hyperthyroid Increased Increased Increased
T3 Toxicosis Normal Normal Normal

 

Reference ranges:

  • males: 1.22 - 4.86
  • females: 0.99 - 4.71

T7 Index result calculator

insert the value from you T7 Index test result.

What does it mean if your T7 Index result is too low?

T7 will usually be decreased in patients with hypothyroidism. It may also be low in patients with non-thyroid illness.

What does it mean if your T7 Index result is too high?

T7 will usually be elevated in patients with hyperthyroidism.

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