A
A
A
The causes of increase and decrease of free thyroxine
Alexey Portnov, medical expert
Last reviewed: 19.10.2021
Last reviewed: 19.10.2021
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If you feel that any of our content is inaccurate, out-of-date, or otherwise questionable, please select it and press Ctrl + Enter.
Diseases and conditions in which the concentration of cT 4 (thyroxine) in the blood serum changes
Increase in concentration
- Hyperthyroidism
- Acute thyroiditis
- Pregnancy
- Obesity
- Hepatitis
- The use of estrogens (oral contraceptives), thyroid drugs, heparin, imidazole derivatives
Reduction in concentration
- Hypofunction of the thyroid gland (myxedema)
- Increased protein loss (kidney syndrome)
- Isenko-Cushing syndrome
- Androgen therapy
- Significant deficiency of iodine
- Exercise stress
- Pangypopituitarism
- Loss of protein through the digestive tract
- The use of glucocorticosteroids, reserpine, sulfonamides, penicillin, potassium iodide
- Resection of the thyroid gland
- Thyroid cancer
- Overdose of thyrostatics