Utilizing indicators allowing sideways to Judge about the functional activity of thyroid gland (the deviation of main exchange and the time of tendon reflex) appreciated the functional state of thyroid system at children 6-7 year old. Sexual differences in the operation of thyroid gland at examined boys and girls have not discovered. Not looking at the absence of correlation connection between defined parameters, both indicators have important diagnostic significance at the appraisal of the functional state of hypophyseally-thyroid system