A few questions help us personalize your report.
TSH (Thyroid-Stimulating Hormone) is the pituitary gland's signal to the thyroid, telling it to produce more or less hormone based on your body's needs. It is the most sensitive early indicator of thyroid dysfunction — a rising TSH means the pituitary is compensating for a flagging thyroid (hypothyroidism), while low TSH suggests the thyroid is overactive (hyperthyroidism). Many people experience clear symptoms — fatigue, weight changes, mood shifts — at TSH values still within the standard 'normal' reference range.
Also known as: sTSH, Third Generation TSH, Thyroid Stimulating Hormone, Thyroid-Stimulating Hormone, Thyrotropic hormone, Thyrotropin, TSH, TSH (3rd Generation)
High TSH indicates your thyroid is underperforming (hypothyroidism) and the pituitary is signaling harder. Low TSH indicates excess thyroid hormone from hyperthyroidism or thyroid medication overdose.
Standard range is 0.4-4.5 mIU/L. Functional practitioners target 1.0-2.5 mIU/L. Many patients feel best with TSH in the lower half of the range.