Is a TSH level of 86.83 mIU/L severe?

　　A TSH (thyroid-stimulating hormone) level of 86.83 mU/L is typically indicative of a severe condition. The normal reference range for TSH is generally 0.3–4.5 mU/L; thus, a value of 86.83 mU/L is markedly elevated.

　　TSH is a hormone secreted by the anterior pituitary gland and functions to stimulate proliferation of thyroid follicular epithelial cells, as well as synthesis and release of thyroid hormones. Clinically, elevated TSH levels are most commonly associated with primary hypothyroidism, Hashimoto’s thyroiditis, or the recovery phase of subacute thyroiditis. Additionally, ectopic TSH-secreting tumors (e.g., in the lung or breast), as well as intake of certain medications such as lithium or potassium iodide, may also cause TSH elevation.

　　Without timely treatment, complications such as pericardial effusion and heart failure may develop; in severe cases, myxedema coma—a life-threatening emergency—may occur. Therefore, if elevated TSH is detected, prompt evaluation at a qualified medical institution is essential to identify the underlying cause and initiate appropriate treatment.