Optimal Result: 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

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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