does t4 rise first when increasing synthroid?
synthroid increase: does t4 rise first when... - Thyroid UK
synthroid increase
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Mccrae
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You mean before FT3? Yes, because it takes time for the T4 to get converted to T3. It's not instantaneous. And it takes even longer for the TSH to react to the new levels after an increase. Which is why we say that you need to leave at least six weeks before retesting. 
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