Hyperthyroidism?,”Plasma TSH is the best initial diagnostic test for patients with suspected hyperthyroidism. Almost all patients with hyperthyroidism have low TSH concentrations due to appropriate suppression by high serum T3/T4 concentrations. If the plasma TSH level is low, free plasma T4 should be measured, and if this is elevated, the diagnosis of clinical hyperthyroidism is established. A 24-hour thyroid radioiodine uptake and scan should be done to differentiate Grave’s hyperthyroidism from other causes. In the management of patients with hyperthyroidism
propranolol is generally used for symptomatic relief until the underlying cause is identified and definitively treated.”