How Is Thy­roid Dis­ease Di­ag­nosed?

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Your doc­tor will re­quest a set of blood tests called thy­roid func­tion tests. These check the lev­els of thy­roid hor­mones and the level of the thy­roid stim­u­lat­ing hor­mone in the brain. De­pend­ing on these re­sults, your doc­tor may also check lev­els of an­ti­bod­ies which may af­fect the thy­roid gland.

Un­der­ac­tive thy­roid – there will be low lev­els of thy­rox­ine but the thy­roid stim­u­lat­ing hor­mone lev­els are high as the brain tries to en­cour­age the thy­roid gland to pro­duce thy­rox­ine

Over­ac­tive thy­roid – there will be high lev­els of thy­rox­ine but now the thy­roid stim­u­lat­ing hor­mone lev­els will be low as the brain tries to stop thy­rox­ine pro­duc­tion.

Sub­clin­i­cal hy­pothy­roidism – here the lev­els of thy­rox­ine are nor­mal, but the thy­roid stim­u­lat­ing hor­mone lev­els are high, so your brain is hav­ing to pro­duce more stim­u­lat­ing hor­mone to make enough thy­rox­ine. This does not need treat­ment but will re­quire mon­i­tor­ing with re­peat blood tests as a pro­por­tion of peo­ple with this will go on to de­velop an un­der­ac­tive thy­roid.

Thy­roid func­tion tests will be done

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