What is T4 (Thyroxine)?
Thyroxines principle function is to stimulate the function of oxygen and thus the metabolism of the cells and tissues in the body. Excessive secretion of thyroxine in the body is known as hyperthyroidism, and the deficient secretion of it is called hypothyroidism.
Purpose of Test
Doctors may order the T4 test if symptoms suggest any kind of thyroid disorder. For example, an overactive thyroid, called hyperthyroidism, is typically associated with weight loss, a fast heart rate and sweating.
Test of Result Interpretation
No preparation required. Preference is a fasting sample.