^

Health

A
A
A

Total thyroxine in the blood

 
, medical expert
Last reviewed: 05.07.2025
 
Fact-checked
х

All iLive content is medically reviewed or fact checked to ensure as much factual accuracy as possible.

We have strict sourcing guidelines and only link to reputable media sites, academic research institutions and, whenever possible, medically peer reviewed studies. Note that the numbers in parentheses ([1], [2], etc.) are clickable links to these studies.

If you feel that any of our content is inaccurate, out-of-date, or otherwise questionable, please select it and press Ctrl + Enter.

T 4 (thyroxine) is the main hormone of the thyroid gland. Its concentration in the blood exceeds that of T 3 by 60 times. The half-life is 5-7 days.

Reference values (norm) of total T 4 (thyroxine) concentration in blood serum

Age

T 4, nmol/l

Newborns:

95-168

0-5 days

152-292

11-15 days

126-214

>15 days

93-186

Children:

1-5 years

94-194

5-10 years

83-172

Adults 10-60 years

Men

59-155

Women

71-142

>60 years

65-138

You are reporting a typo in the following text:
Simply click the "Send typo report" button to complete the report. You can also include a comment.