tsh is less than 0.05?
More patients with TSH levels <0.05 mIU/L progress to overt hyperthyroidism than those with serum TSH levels ranging from 0.05 to 0.1 mIU/L. Patients younger than 65 years of age who have subclinical hyperthyroidism have a somewhat different outcome than older patients, depending on the cause of the disease.