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Subclinical hyperthyroidism

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Subclinical hyperthyroidism is a disorder in which TSH levels are suppressed in the presence of normal concentrations of free thyroid hormones.

The degree of TSH suppression required for the diagnosis is controversial but a level less than 0.1 mU/L is widely accepted.

  • subclinical hyperthyroidism may be responsible for an increased cardiovascular risk, especially in presence of undetectable serum TSH (1)
  • elderly patients with subclinical hyperthyroidism have an increased risk of atrial fibrillation, particularly in presence of an underlying heart disease (1)
  • elderly patients with exogenous and endogenous subclinical hyperthyroidism have an increased risk of bone fracture (1)

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