What is the normal range for thyroid TSH?

In adults, the normal reference range for thyroid-stimulating hormone (TSH) is approximately 0.38–5.57 µIU/mL. Elevated TSH levels are most commonly caused by primary hypothyroidism. So, what is the normal TSH value for the thyroid?

What is the normal TSH value for the thyroid?

TSH—also known as thyroid-stimulating hormone—is a hormone secreted by the pituitary gland to regulate normal thyroid function. It serves as a critical diagnostic and therapeutic indicator for assessing whether thyroid function is within normal limits. In healthy individuals, the typical reference range is 0.24–4.2 µIU/mL. Values above this range indicate hypothyroidism (commonly termed “hypothyroidism”); values below this range suggest hyperthyroidism (commonly termed “hyperthyroidism”).

TSH is one of the most frequently used clinical markers for diagnosing either hyperthyroidism or hypothyroidism. However, TSH levels may fluctuate with age. For instance, in infants under 1 year of age, the normal range may be 1.7–9.1 µIU/mL; in children and adolescents, it typically falls between 0.7–5.7 µIU/mL. For adults and middle-aged individuals, the generally accepted normal reference range is 0.4–4.2 µIU/mL. Individuals whose TSH values fall outside this range should undergo further evaluation—including measurement of thyroglobulin—to indirectly assess circulating thyroid hormone levels.

TSH values vary slightly with age, and also differ in patients with hyperthyroidism. These variations are routinely considered and utilized by clinicians in daily practice. We hope this information is helpful to you!