Biomarkers

What is T7 Index?

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.

HIGH RESULTS:

T7 will usually be elevated in patients with hyperthyroidism.

LOW RESULTS:

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

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

thyroid panel t7 index

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