RESUMO
Thyroid hormones, triiodothyronine [T3] and thyroxin [T4], affect almost all metabolic activities of tissues and are produced under influence of the anterior pituitary hormone, the thyroid stimulating hormone [TSH], which stimulates secretion of thyroid hormones, and is itself under the control of the hypothalamic thyroid releasing hormone [TRH]. The present study was conducted to observe the effect of non-detectable levels of TSH on thyroid hormones, on the basis of gender and age. Analysis of data through student's 't'-test revealed that prevalence of thyroid disorders in the studied group was more among females. However, the disorders were not age dependent. Most common condition associated with non-detectable TSH levels was hyperactivity of the thyroid gland, followed by sub-clinical hyperthyroidism