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A member asked:
What could cause my t4 levels to be very low?
A doctor has provided 1 answer
Depends: Depending on the type of assay - free T4 or an index (that might be low because of binding problems unrelated to thyroid function). Most of the time a true low T4 is due to an underactive thyroid. Rarely the pituitary that controls the thyroid may be low. See a thyroid doctor.
Answered 5/3/2018
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