But T3 uptake % is not very useful by itself. The T3 uptake test must be performed alongside a total T4 test in order to calculate free T4, also called the free T4 index. A high free T4 index may indicate hyperthyroidism while low levels may point to hypothyroidism [2]. The T3 uptake...
Decreased levels are found in hypothyroidism, normal pregnancy, and hyperestrogenis status. This test measures the amount of thyroxine-binding globulin (TBG) in the patient's serum. When TBG is increased, T3 uptake is decreased, and vice versa. T3 Uptake does not measure the level of T3 ...
Thyroid iodine uptake was normal, thus, primary hyper-thyroidism was excluded. Since the patient had normal TFTspreviously, RTHβand FDH were unlikely. The discrepancybetween TSH and T3of the patient led to a suspicion of thedetected interference.The TSH concentrations of the patient before ...