How to assess functional state of thyroid gland, and what should we do in situation when thyroid function tests are inadequate?

In most cases, estimation of tests of the functional state of the thyroid gland does not cause difficulties. Often, according to results of hormonal research, we can conclude that there is a manifest (subclinical) hypothyroidism or a manifest (subclinical) hyperthyroidism. In these situations, difficulties in diagnosing and prescribing treatment to the patient usually do not arise. However, in clinical practice, can be a situation when the results of laboratory researches either do not correspond to clinical picture or do not correspond to the normal functioning of the pituitary-thyroid axis by the principle of log negative relationship. In such situations, quite often inadequate results can be explained by laboratory errors, effect of drugs or existence of genetic disease. Also, recently more and more questions arise in the diagnosis of the syndrome of euthyroid pathology. The correct algorithm of action in this situation will play a key role in diagnosing and identification of further tactics of patient management. In this study will be considered factors that lead to changes in laboratory researches and structured approach to assess functional state of the thyroid gland, which has big importance in clinical practice.