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What blood tests are used to diagnose an underactive thyroid?

April 26, 2017blood Diagnose tests Thyroid underactive Used

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What blood tests are used to diagnose an underactive thyroid?

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To diagnose an underactive thyroid (hypothyroidism), your GP will take a sample of your blood and the levels of thyroid-stimulating hormone (TSH) and free thyroxine (FT4) will be measured. If your TSH level is higher than normal and your FT4 level lower than usual, you will be diagnosed with hypothyroidism.