Represents the total of free and bound T3 in the blood, represents approximately 90% of T3. A small percentage is made directly in the thyroid gland and rest predominantly made in the liver and kidney by the conversion of T4 to T3. Levels are used to determine T4 conversion syndrome, Euthyroid sick syndrome, Selenium and Iodine sufficiency and Hyperthyroidism.
Liver & Gallbladder
Minerals & Metals