What Is Subclinical Hypothyroidism?

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Subclinical hypothyroidism is a mild or early form of hypothyroidism in which symptoms have not yet developed. It can cause an increase in total cholesterol levels and impair the pumping ability of your heart. If you have symptoms of hypothyroidism, your doctor will order blood tests to check hormone levels. These may include:
  • Thyroid-stimulating hormone (TSH)
  • T4 (thyroxine)
Lower-than-normal T4 levels usually mean you have hypothyroidism. However, some people may have increased TSH levels while having normal T4 levels, and this is called subclinical mild hypothyroidism. It is believed to be an early stage of hypothyroidism. Key word: subclinical hypothyroidism
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