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Subclinical hypothyroidism is a biochemical diagnosis characterized by an elevated serum TSH level, but with a normal serum free thyroxine level. [48] [49] [50] The incidence of subclinical hypothyroidism is estimated to be 3-15% and a higher incidence is seen in elderly people, females and those with lower iodine levels. [48]
Certain medications can have the unintended side effect of affecting thyroid function. While some medications can lead to significant hypothyroidism or hyperthyroidism and those at risk will need to be carefully monitored, some medications may affect thyroid hormone lab tests without causing any symptoms or clinical changes, and may not require treatment.
To detect a lack of thyroid hormones (hypothyroidism), or excess of thyroid hormones (hyperthyroidism). The two thyroid hormones are Thyroxine ( T 4 ) and Tri-iodothyronine ( T 3 ). T 4 and T 3 can be measured by their total amount, or free amount.
Levothyroxine, a drug used to treat hypothyroidism, can lead to reduced bone mass and density in older adults with normal thyroid levels, a small cohort study has shown.
Patients with Graves' disease can also undergo periods of hypothyroidism (inadequate production of thyroid hormone; see symptoms of hypothyroidism), due to the challenges of finding the right dosage of thyroid hormone suppression and/or supplementation. The body's need for thyroid hormone can also change over time, such as in the first months ...
Furthermore, reviewing their medications and possible dietary supplements is important, as several medications can affect thyroid hormone levels. [14] Levothyroxine is also used to treat subclinical hypothyroidism, which is defined by an elevated TSH level and a normal-range free T 4 level without symptoms. [14]
Hypothyroidism is common in pregnancy with an estimated prevalence of 2-3% and 0.3-0.5% for subclinical and overt hypothyroidism respectively. [8] Endemic iodine deficiency accounts for most hypothyroidism in pregnant women worldwide while chronic autoimmune thyroiditis is the most common cause of hypothyroidism in iodine sufficient parts of the world.
A relapsing encephalopathy occurs in association with autoimmune (Hashimoto's or Ord's thyroiditis), with high titers of antithyroid antibodies. Clinically, the condition may present one or more symptoms. Onset is often gradual and may go unnoticed by the patient and close associates to the patients.
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