Background: Hormonal studies in patients with multiple sclerosis are rare and they often produce results which are difficult to interpret. These investigations, however, are becoming more and more important as they may cast some light on possible interrelationships between hormonal and immune systems. The aim of the present work was to investigate endocrine function in patients with multiple sclerosis on the basis of blood levels of selected pituitary (TSH, ACTH, GH) and thyroid hormones (T3, T4), and cortisol.
Material/Methods: Forty-nine MS subjects, including 25 menstruating women, 6 post-menopausal women and 18 men were included in the analysis. The hormones were measured by radioimmunoassay and immunoradiometric assay kids.
Results: Pituitary function in respect of TSH, corticotropin and growth hormone secretion was normal. Both men and women suffering from multiple sclerosis manifested low serum T3 concentrations coexisting with normal T4 levels which may indicate changed peripheral conversion pathway of thyroid hormones. On the other hand, the disturbances in pituitary-adrenal cortex system in respect of glycocorticosteroid secretion were not observed.
Conclusions: Normal function in respect to pituitary hormones (TSH, corticotropin, growth hormone) and normal T4 level versus low serum T3 concentration may indicate changes in peripheral conversion pathway of thyroid hormones in MS patients.

Keywords: Multiple Sclerosis, Hormones, analysis