What hormone is measured by the TSH test?

The TSH test measures Thyroid Stimulating Hormone. This hormone plays a critical role in regulating the function of the thyroid gland, which produces hormones that control metabolism, energy levels, and overall growth and development in the body. When the pituitary gland releases TSH, it stimulates the thyroid to produce thyroxine (T4) and triiodothyronine (T3), the primary hormones involved in these vital processes.

Monitoring TSH levels can help diagnose various thyroid disorders. For instance, elevated TSH levels may indicate hypothyroidism, where the thyroid is underactive, while low levels can suggest hyperthyroidism, where the thyroid is overactive. Understanding the role of TSH is essential for identifying and managing thyroid conditions effectively, making this test an important tool in assessing a patient's endocrine health.