Subclinical hyperthyroidism

Subclinical hyperthyroidism, referred to as subclinical hyperthyroidism, refers to the absence of clinical symptoms, or the symptoms are inexact and not specific. Although serum FT3 and FT4 are within the normal range, serum TSH is lower than the reference range, and the exception may cause serum TSH Reduced other diseases, thyroid disease diagnosed solely by laboratory test results. According to serum TSH levels, they can be divided into two categories: ① serum TSH is 0.1 to 0.45 mU / L, which is slightly reduced within the detectable range of serum TSH, and ② serum TSH is significantly reduced, less than 0.1 mU / L.