What does the thyroxin test measure in the blood?

The thyroxin test specifically measures the levels of T4, also known as thyroxine, in the blood. T4 is one of the primary hormones produced by the thyroid gland and plays a crucial role in regulating metabolism, energy generation, and maintaining overall hormonal balance in the body.

Thyroxine is crucial for normal growth and development and has a direct impact on various physiological processes. The concentration of T4 in the blood can provide important insights into thyroid function and can help diagnose conditions such as hypothyroidism or hyperthyroidism.

Other hormones related to thyroid function, such as T3 (triiodothyronine), TSH (thyroid-stimulating hormone), and TBG (thyroxine-binding globulin), have different roles and are measured through separate tests when evaluating thyroid health and functionality. This distinction underscores why the thyroxin test is specifically focused on measuring T4 levels.