some possible causes of discrepancy between clinical thyroid status and the index are a low index in euthyroid patients due to a fall in serum thyroxine-binding prealbumin ( ; sick euthyroid ' ) , a raised index in euthyroid patients due to latent thyroid heart disease , and a normal index in thyrotoxicosis due to preferential secretion of triiodothyronine .
C0040132
thyroid
C0040156
thyrotoxicosis