T4 Test

The T4 test, also known as the thyroxine test, is a blood test that measures the levels of thyroxine (T4), a thyroid hormone, in the bloodstream. T4 is one of the two primary hormones produced by the thyroid gland and plays a crucial role in regulating metabolism, energy production, and various bodily functions. This test is commonly used to assess thyroid function and diagnose thyroid disorders. Abnormal levels of T4 can indicate an overactive thyroid (hyperthyroidism) or an underactive thyroid (hypothyroidism).