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A member asked:
I suffer from hashimoto. my last two thyroid test months apart, tsh and t3 are normal but my t4 is high. increase palpitations. what could cause normal tsh and t3 but high t4?
2 doctors weighed in across 2 answers
More data is needed. Are you taking thyroid hormone replacement? What is the T4 level and what is the the lab range for that test?
Answered 8/12/2022
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All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Talk to the doctor who ordered the tests. Having said that, total T4 is affected by serum levels of thyroxine binding protein. Higher levels result in high total T4 but free T4, the active form, may be normal. Wish you good health!
Answered 8/20/2022
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