if my thyroid profile was normal tsh , free thyroxine and free t3 does that mean my total t4 would be normal or is that a diff. test x
t4: if my thyroid profile was normal tsh , free... - Thyroid UK
t4
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jazzanne
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diogenesRemembering
T4 is not the same as free T4. The reason is that the total amount of T4 you have in your blood depends on the amount of the proteins that carry it. People can have amounts that can vary person-to-person by a factor of at least 10. So the same free T4 could arise in two people whose carrier proteins, and therefore the amount of T4 they carry, (and T3) could be 10 fold different.
so is it a waste of time getting t4 tested if free t4 and t3 and tsh are normal?
In a word, yes. It tells you no more than FT4 does, and can mislead.
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diogenesRemembering
Yes the free thyroxine is FT4 and your number is in the middle of the usual normal range 10-23.
thanks x
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