T4 Free (FT4), Serum

Free thyroxine (FT4) is the main thyroid hormone that regulates Metabolism and energy levels in the body. The FT4 test helps diagnose thyroid disorders such as Hypothyroidism and Hyperthyroidism.
FT4 function: Thyroxine (T4) is a hormone produced by the thyroid gland that regulates Metabolism, maintains energy levels, and helps control body temperature. Free T4 is the active form of the hormone, unbound to blood proteins, and capable of entering cells to exert its effects. It plays a crucial role in maintaining overall metabolic balance.
Test significance: The FT4 test is used to diagnose thyroid disorders such as Hypothyroidism (low thyroid function) and Hyperthyroidism (overactive thyroid). This test helps doctors assess thyroid gland efficiency and whether Hormone therapy is needed.
Diseases: Elevated free T4 levels may indicate Hyperthyroidism, while low levels may point to Hypothyroidism. Both conditions require diagnosis and treatment to restore hormonal balance.