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Subclinical Hypothyroidism

Meaning

Subclinical Hypothyroidism is a common endocrine disorder characterized by normal levels of free thyroxine (FT4) and free triiodothyronine (FT3) in the circulation, but with an elevated serum concentration of Thyroid-Stimulating Hormone (TSH). This laboratory profile indicates that the pituitary gland is working harder to stimulate a mildly underperforming thyroid gland, suggesting an early or subtle stage of thyroid dysfunction. While patients may be asymptomatic, or present with non-specific symptoms, this condition warrants clinical monitoring due to its potential progression to overt hypothyroidism and its association with cardiovascular risk. A careful clinical translator will emphasize the need for individualized management based on TSH level and patient presentation.