It is called central hypothyroidism, characterized by a TSH that is well within the
range, and Free T3 and Free T4 that are also low in the
range. This results from dysfunction in the hypothalmic/pituitary system that does not produce enough TSH to stimulate the thyroid gland adequately. What symptoms are you having? If tested beyond TSH, please post those results, along with reference ranges shown on the lab report.