What is a normal T3 level?

The normal range for T3 (triiodothyronine) levels can vary slightly depending on the laboratory reference range and the specific testing method used. Typically, the reference range for total T3 is around 80 to 200 nanograms per deciliter (ng/dL) or 1.23 to 3.08 nanomoles per liter (nmol/L). Free T3 levels, which measure the unbound and biologically active fraction of T3, have a normal range of approximately 2.3 to 4.2 picograms per milliliter (pg/mL) or 3.54 to 6.47 picomoles per liter (pmol/L). It's important to note that reference ranges may vary slightly between laboratories. Therefore, it is recommended to interpret T3 results in the context of the specific laboratory's reference range and in conjunction with other thyroid function tests and clinical evaluation performed by a healthcare professional. They can assess the results comprehensively and provide accurate interpretation based on the individual's specific circumstances and clinical presentation.