T4

About Test

The T4 (Thyroxine) test measures the level of thyroxine, a thyroid hormone, in the blood. Thyroxine (T4) is produced by the thyroid gland and is essential for regulating metabolism, growth, and energy levels. It is one of the primary hormones produced by the thyroid, alongside triiodothyronine (T3).

The T4 test is used to evaluate thyroid function and diagnose thyroid-related conditions, such as hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid). Elevated T4 levels may indicate hyperthyroidism, thyroiditis, or certain types of thyroid cancer. Low T4 levels can suggest hypothyroidism, where the thyroid gland is not producing enough hormones.

This test can be performed alongside other thyroid function tests, such as T3 and TSH (Thyroid-Stimulating Hormone), to provide a comprehensive assessment of thyroid health. Regular monitoring of T4 levels helps healthcare providers diagnose thyroid disorders, guide treatment decisions, and maintain balanced thyroid hormone levels for overall health and well-being.