The thyroid hormone ratio, derived from dividing the concentration of triiodothyronine (T3) by that of thyroxine (T4), serves as an index reflecting thyroid hormone conversion efficiency. Calculating this ratio can offer insights into individual thyroid hormone metabolism. For instance, a high value might indicate enhanced T4 to T3 conversion, while a low value could point to impaired conversion or altered thyroid function.
This hormonal calculation is significant because T3 is the more active form of thyroid hormone, exerting a greater influence on metabolic processes than T4. Evaluating the relationship between these hormones can be valuable in understanding potential causes of thyroid dysfunction. Historically, assessing only T4 levels was common; however, recognizing the importance of T3 and its conversion efficiency has led to a more nuanced approach to thyroid assessment.
