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Subclinical hypothyroidism is the third stage of the condition, while overt hypothyroidism is the 4th. When the TSH is between 2.5 and 10 mIU/L and T3 and T4 is within normal limits, this is known as subclinical hypothyroidism (at this point, people may or may not have thyroid antibodies). This means that your thyroid is still able to make enough thyroid hormone, but not without sacrifice.
Subclinical, or mild, hypothyroidism (mildly underactive thyroid), also called early-stage hypothyroidism, is a condition in which thyrotropin (TSH) levels have started to increase in response to an early decline in T4 levels in the thyroid. However, blood tests for T4 are still normal. Thyroxine (T4) is the key hormone produced in the thyroid gland. 2  Low levels of T4 produce hypothyroidism, and high levels produce hyperthyroidism. 3  Thyroxine converts to triiodothyronine (T3), which is a more biologically active hormone.