To diagnose hyperthyroidism, a healthcare professional may order blood tests to gauge the levels of thyroid hormones in the body, such as thyroid-stimulating hormone (TSH), and perform a thorough clinical assessment. Other tests that may be performed include thyroid ultrasound, thyroid radioactive iodine uptake, and additional thyroid hormone levels like triiodothyronine (T3), thyroxine (T4), or free T4 (FT4).
How is hyperthyroidism diagnosed?
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•Last Updated: May 16, 2025
Hyperthyroidism is diagnosed through blood tests that measure thyroid hormone levels — including thyroid-stimulating hormone (TSH), T3, T4, and free T4 — along with a comprehensive clinical assessment. Additional diagnostic tests may include thyroid ultrasound and radioactive iodine uptake.