TSHFree T4Free T3InterferencesThyroid function tests are often used to diagnose thyroid diseases. Difficulty in interpretation of biochemical results or discrepancies between circulating concentration of thyroid hormones or TSH and the clinical status often occur. In fact, in moderate degrees of hypo and...
An isolated low TSH level, the most frequent discrepancy, must be carefully investigated in order to assess the reality of a subclinical hyperthyroidy. Euthyroid hyperthyroxinemia if usually iatrogenic. Discrepancies between T4 and T3 levels are the consequence of the complexity of the extra-thyroid...