The Thyroid Stimulating Hormone (TSH) test measures the level of TSH in your body. TSH is a hormone produced by the pituitary gland that helps regulate the thyroid gland, which is responsible for controlling your metabolism.

This test is used to diagnose thyroid problems, such as hypothyroidism (an underactive thyroid) or hyperthyroidism (an overactive thyroid).

Symptoms of thyroid problems can include fatigue, weight gain or loss, hair loss, and changes in mood or energy levels.

If your TSH levels are too high or too low, it can indicate a problem with your thyroid gland.