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Subclinical hypothyroidism happens when you have elevated thyroid-stimulating hormone (TSH) levels with normal levels of thyroxine (T4). You don’t technically have hypothyroidism (commonly called overt hypothyroidism, in comparison), but it has the potential to develop into overt hypothyroidism.
Elevated or suppressed TSH levels can signal potential thyroid dysfunction, such as hypothyroidism or hyperthyroidism. However, relying solely on TSH may overlook more subtle imbalances. Research indicates that up to 7% of thyroid imbalances may be missed when TSH is used as the only marker.
In some individuals with a low TSH, only the T3 is elevated and the FT4 or FTI is normal. T3 testing rarely is helpful in the hypothyroid patient, since it is the last test to become abnormal. Patients can be severely hypothyroid with a high TSH and low FT4 or FTI, but have a normal T3.
Subclinical hypothyroidism occurs when TSH levels are slightly elevated but T3 and T4 are normal. Subclinical hypothyroidism and full-blown hypothyroidism share the same causes. These include:...
Many conditions result in increases or decreases in serum total thyroxine (T4) and triiodothyronine (T3) concentrations, associated with normal thyroid-stimulating hormone (TSH) concentrations and no symptoms or signs of thyroid dysfunction.
Subclinical hyperthyroidism is defined by a low or undetectable serum thyroid-stimulating hormone (TSH) level, with normal free thyroxine (T 4) and total or free triiodothyronine (T 3) levels....
What happens when T3 levels are high? Higher-than-normal T3 levels typically indicate hyperthyroidism (overactive thyroid). Hyperthyroidism has several causes, including Graves’ disease (an autoimmune condition), thyroid nodules and thyroiditis (inflammation of your thyroid gland).
Normal thyroid levels for adults are: TSH: 0.5 to 5.0 mIU/L (milli-international units per liter) Total T4: 5.0 and 12.0μg/dL (micrograms per deciliter) Total T3: 80 and 220 ng/dL (nanograms per deciliter)
Postpartum thyroiditis in 5-10% women. If past history, screen prior to pregnancy and 6-8wks postpartum + offer annual TSH check. Women with Type 1 Diabetes 3x risk of postpartum thyroid dysfunction, should have TFT & TP ab status preconception, booking, 3mths postpartum.
A high TSH and normal T4 is not a normal thyroid lab test pattern. This combo is often associated with hypothyroid symptoms. Find out why.