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Section: Clinical Chemistry5.8 Clinical Endocrinology
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Which of the following statements regarding thyroid hormones is
true
?
Both protein-bound and free T
3
and T
4
are physiologically active
Total T
3
and T
4
are influenced by the level of thyroxine-binding globulin
Variation in thyroxine-binding protein levels affects both free T
3
and T
4
An elevated serum total T
4
and T
3
is diagnostic of hyperthyroidism