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What blood tests are used to diagnose an underactive thyroid? What are normal thyroid levels?

April 26, 2017blood Diagnose levels normal tests Thyroid thyroid-stimulating hormone TSH underactive Used

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What blood tests are used to diagnose an underactive thyroid? What are normal thyroid levels?

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To diagnose an underactive thyroid, your doctor will ask you to take a blood test to measure the thyroid-stimulating hormone (TSH) and free thyroxine (FT4) levels in your blood. If your TSH level is higher than normal and your FT4 level lower than usual, a diagnosis of hypothyroidism will be made.