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  2. Thyroid function tests - Wikipedia

    en.wikipedia.org/wiki/Thyroid_function_tests

    Total triiodothyronine (Total T 3) is rarely measured, having been largely superseded by free T3 tests. Total T3 is generally elevated in hyperthyroidism and decreased in hypothyroidism. [2] Reference ranges depend on the method of analysis. Results should always be interpreted using the range from the laboratory that performed the test.

  3. Thyroid disease - Wikipedia

    en.wikipedia.org/wiki/Thyroid_disease

    Initial blood tests often include thyroid-stimulating hormone (TSH) and free thyroxine (T4). [9] Total and free triiodothyronine (T3) levels are less commonly used. [9] If autoimmune disease of the thyroid is suspected, blood tests looking for Anti-thyroid autoantibodies can also be obtained. Procedures such as ultrasound, biopsy and a ...

  4. Hypothyroidism - Wikipedia

    en.wikipedia.org/wiki/Hypothyroidism

    Hypothyroidism (also called underactive thyroid, low thyroid or hypothyreosis) is a disorder of the endocrine system in which the thyroid gland does not produce enough thyroid hormones. [3] It can cause a number of symptoms, such as poor ability to tolerate cold , extreme fatigue, muscle aches , constipation , slow heart rate , depression , and ...

  5. Euthyroid sick syndrome - Wikipedia

    en.wikipedia.org/wiki/Euthyroid_sick_syndrome

    The most common hormone pattern in nonthyroidal illness syndrome is low total and free T3, elevated rT3, and normal T4 and TSH levels, although T4 and TSH suppression may occur in more severe or chronic illness. [3]

  6. Thyroid-stimulating hormone - Wikipedia

    en.wikipedia.org/wiki/Thyroid-stimulating_hormone

    The National Academy of Clinical Biochemistry (NACB) stated that it expected the reference range for adults to be reduced to 0.4–2.5 μIU/mL, because research had shown that adults with an initially measured TSH level of over 2.0 μIU/mL had "an increased odds ratio of developing hypothyroidism over the [following] 20 years, especially if ...

  7. Living longer, not healthier: Study finds periods of poor ...

    www.aol.com/living-longer-not-healthier-study...

    A study led by Mayo Clinic found a “widening gap between lifespan and healthspan" among 183 countries. The lead researcher and another doctor discuss the drivers of poor health late in life.

  8. Hashimoto's thyroiditis - Wikipedia

    en.wikipedia.org/wiki/Hashimoto's_thyroiditis

    Immunoassay tests of Free T 4 and Free T 3 may overestimate concentrations, particularly at low thyroid hormone levels, which is why results are typically read in conjunction with TSH, a more sensitive measure. [64] LC-MSMS assays are rarer, but they are "highly specific, sensitive, precise, and can detect hormones found in low concentrations ...

  9. Jostel's TSH index - Wikipedia

    en.wikipedia.org/wiki/Jostel's_TSH_index

    Jostel's TSH index (TSHI or JTI), also referred to as Jostel's thyrotropin index or Thyroid Function index (TFI), is a method for estimating the thyrotropic (i.e. thyroid stimulating) function of the anterior pituitary lobe in a quantitative way. [1] [2] The equation has been derived from the logarithmic standard model of thyroid homeostasis.