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101 Possible Causes for Free T4 Levels Low

  • Goiter

    A 10-year old child born to consanguineous parents presented with an extremely large goiter, a low free T4 level and free T4 index, and normal TSH concentration.[ncbi.nlm.nih.gov] Key laboratory and imaging tests Low/suppressed serum TSH concentrations with elevated serum total and free T3 and T4 levels.[endocrinologyadvisor.com] The findings of undetectable thyroglobulin (TG) and low free T4, and an elevated free T3/free T4 ratio suggested the possibility of a defect in TG synthesis.[ncbi.nlm.nih.gov]

  • Hypothyroidism

    TSH level was elevated, free T3 level was low, free T4 level was normal, and hypothyroidism due to hepatic hemangiomas was diagnosed.[ncbi.nlm.nih.gov] If the TSH level is normal or low and serum free T4 levels are low, this is suggestive of central hypothyroidism (not enough TSH or TRH secretion by the pituitary gland or[en.wikipedia.org] In secondary hypothyroidism, free T4 and serum TSH are low (sometimes TSH is normal but with decreased bioactivity).[smartypance.com]

  • Hashimoto Thyroiditis

    Free T4 is the amount of thyroid hormone available in the blood that body tissues use to support their activities. A low free T4 level is evidence of hypothyroidism.[innerbody.com] Free T4 is low. Low total T4 or free T4 level in the presence of an elevated TSH level confirms the diagnosis of primary hypothyroidism.[ncbi.nlm.nih.gov] Testing may be ordered when an individual has abnormal TSH and/or free T4 test results or signs and symptoms of a low or high level of thyroid hormones or the presence of[labtestsonline.org]

  • Hyperthyroidism

    Serum T4 (thyroxine) and T3 (triiodothyronine) levels are usually high. In subclinical hyperthyroidism, TSH is low in the presence of normal T4 and T3 level.[dermnetnz.org] In hyperthyroidism, the thyroid-stimulating hormone (TSH) will be very low and the Free T4 and Free T3 will be elevated.[amymyersmd.com] ., measurement of serum levels of total (or preferably free) thyroxine (T4) and thyroid stimulating hormone (TSH).[web.archive.org]

  • Familial Multinodular Goiter

    Key laboratory and imaging tests Low/suppressed serum TSH concentrations with elevated serum total and free T3 and T4 levels.[endocrinologyadvisor.com] Subclinical thyrotoxicosis (commonly observed in older patients with TMNG): Low or suppressed serum TSH and normal total and free T3 and total and free T4 levels Imaging[endocrinologyadvisor.com] […] stimulating hormone (TSH) and elevated serum total and free triiodothyronine (T3) and total free thyroxine (FT4) levels T3 toxicosis: Suppressed serum TSH and elevated T3 levels[endocrinologyadvisor.com]

  • Graves Disease

    In the Cox proportional hazard regression analysis, higher free T4 levels ( 1.4 ng/dL; hazard ratio [HR], 3.252; 95% confidence interval [CI], 1.022-10.347) and low levels[ncbi.nlm.nih.gov] Of the 350 HIV-infected patients studied; 16% had hypothyroidism, 2.6% had overt hypothyroidism, 6.6% had subclinical hypothyroidism, and 6.8% had a low level of free T4.[doi.org] Only receipt of stavudine and low CD4 cell count were associated with hypothyroidism [ 67 ].[doi.org]

  • Struma Ovarii

    Four weeks later, TFTs were repeated and revealed a high level of serum TSH, and low total T4 and free T4 levels. L-thyroxine replacement was started.[ijmbs.org] Thyroid function test (TFT) revealed high serum triiodothyronine (T3) and serum thyroxine (T4) with low serum TSH level (TSH 0.01 μIU/ml [0.5–4.2], serum T3, 147 ng/dL [70[ijmbs.org] –130 ng/dL], T4, 17 μg/dl [normal, 6.5–12 μg/dL], free T4, 2.9 ng/dL [0.7–1.8]).[ijmbs.org]

  • Thyroiditis

    Low radioactive iodine uptake Low serum thyroid stimulating hormone (TSH) level High serum free T4 (thyroid hormone, thyroxine) level High erythrocyte sedimentation rate[endocrinesurgery.ucla.edu] Free T4 is the amount of thyroid hormone available in the blood that body tissues use to support their activities. A low free T4 level is evidence of hypothyroidism.[innerbody.com] In the initial stages, your free T4 levels will be high while your TSH levels will be low.[healthline.com]

  • Toxic Nodular Goiter

    As shown in Figure 5-1, a state of subclinical hyperthyroidism with low TSH but normal free T4 and free T3 levels may exist for years before progression to clinical hyperthyroidism[entokey.com] Key laboratory and imaging tests Low/suppressed serum TSH concentrations with elevated serum total and free T3 and T4 levels.[endocrinologyadvisor.com] […] serum levels of thyroid hormones.[entokey.com]

  • Thyroid Cancer

    If they are low, it may be a sign of hyperthyroidism . TSH levels are usually normal or high with thyroid cancer.[labtestsonline.org] T3 and Free T4 (thyroid hormones)—these are hormones made by the thyroid gland. They are sometimes measured along with TSH to evaluate thyroid function.[labtestsonline.org]

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