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de Nayer, P. et al.

Sex hormone-binding protein in hyperthyroxinemic patients: a discriminator for thyroid status in thyroid hormone resistance and familial dysalbuminemic hyperthyroxinemia.

Sex hormone-binding globulin (SHBG) levels in serum are affected by thyroid status; hyperthyroidism is associated with high SHBG levels, whereas hypothyroid patients have low or normal SHBG levels. This study was undertaken to test the usefulness of SHBG determinations to define the thyroid status in two hyperthyroxinemic states: thyroid hormone resistance ( THR) and familial dysalbuminemic hyperthyroxinemia (FDH). Serum SHBG levels were determined in 193 patients and 26 normal subjects using an IRMA-type RIA. In the control group, the mean values in women (58.9 nmol/liter) and men (32.7 nmol/liter) were significantly different (P less than 0.001). In adult subjects with THR, SHBG levels were within the normal range, with mean values of 54.8 nmol/liter (range, 28.7-82.5 nmol/liter) in women and 18 and 20 nmol/liter in two men. In FDH subjects, the mean SHBG levels did not differ from the normal values; they averaged 60.7 nmol/liter in women and 42.3 nmol/liter in men. From these data we conclude that in THR and FDH, free T4 levels elicit an appropriate hepatic response corresponding to the euthyroid status of these subjects. SHBG determination may, therefore, serve as an in vitro test for end-organ sensitivity to thyroid hormones.[1]

References

Sex hormone-binding protein in hyperthyroxinemic patients: a discriminator for thyroid status in thyroid hormone resistance and familial dysalbuminemic hyperthyroxinemia. de Nayer, P., Lambot, M.P., Desmons, M.C., Rennotte, B., Malvaux, P., Beckers, C. J. Clin. Endocrinol. Metab. (1986) [Pubmed]

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