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Familial dysalbuminaemic hyperthyroxinaemia.
  1. S. J. Fleming,
  2. G. F. Applegate,
  3. C. G. Beardwell
  1. Withington Hospital, Manchester, UK.


    Familial dysalbuminaemic hyperthyroxinaemia (FDH) can be confused with thyrotoxicosis if clinical signs and laboratory tests are misinterpreted. We describe three members of the same family with FDH who were erroneously treated for thyrotoxicosis. Screening of other family members resulted in the discovery of a further six patients at risk of being misdiagnosed as thyrotoxic. Clinical and biochemical findings relevant to the diagnosis of FDH are discussed.

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