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This Thyroid Stimulating Hormone Test or TSH test evaluates the overall function of the thyroid by measuring levels of thyroid-stimulating hormone (TSH). This substance triggers the production of thyroxine (T4) and triiodothyronine (T3) which play active roles in the body’s metabolism regulation. However, unexplained changes in weight, mood, or sleep patterns can be indicative of a thyroid condition. This Thyroid Stimulating Hormone Test can help identify hypothyroidism and hyperthyroidism and can be used to determine your potential risk for other thyroid conditions.