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Clinical Chemistry 37: 1430-1431, 1991;
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Clinical Chemistry, Vol 37, 1430-1431, Copyright © 1991 by American Association for Clinical Chemistry

Prevalence of familial dysalbuminemic hyperthyroxinemia in serum samples received for thyroid testing

G Arevalo
Department of Medicine, Hospital Privado Centro Medico de Caracas, San Bernardino, Venezuela.

The prevalence of familial dysalbuminemic hyperthyroxinemia (FDH), a condition sometimes mistaken for hyperthyroidism, has not been clearly established. I present a study of the prevalence of FDH in serum samples received for thyroid-function tests in a reference laboratory. A prospective study of 15,674 serum samples was carried out over 24 months, of which 13,232 cases were from women (84.42%) and 2442 were from men (15.58%). FDH was diagnosed in 26 cases, 22 in women and four in men. Therefore, the prevalence of FDH in the total number of samples from both sexes was 0.17%, 0.17% in women, and 0.16% in men, which is consistent with a dominant autosomal type of familial transmission. These findings demonstrate that cases of FDH occur frequently; therefore, every laboratory must be prepared to recognize them and thus avoid an incorrect diagnosis of the patient's thyroid function.


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