The serumtyrosine level as an index of thyroid function.

@article{Malamos1966TheSL,
  title={The serumtyrosine level as an index of thyroid function.},
  author={B K Malamos and CONSTANTINOS J. Miras and J N Karli-Samouilidou and Demetrios A. Koutras},
  journal={The Journal of endocrinology},
  year={1966},
  volume={35 3},
  pages={
          223-8
        }
}
serum tyrosine appear to be a useful test for the diagnosis of hyperthyroidism, not invalidated by previous iodine administration and not involving the use of radio-isotopes. Administration of vitamin C reduced the increased values of tyrosine in thyrotoxicosis to normal levels. It is suggested that a latent vitamin C deficiency may partly explain the increase in the serum tyrosine values in thyrotoxicosis. 
10 Citations
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TLDR
The present investigation was intended to determine whether abnormal responses to orally administered loads of tyrosine are restricted to patients with thyrotoxicosis, as well as similar assays of oral tyrosines tolerance in hypothyroid subjects. Expand
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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
1-Nitroso-2-naphthol reacts with both tyrosine and tyramine to form a red-colored product which gradually changes to a stable yellow chromo- phore and has been isolated. Expand
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