“…All studies measured T4 concentrations and elevated levels were reported far more commonly than low ones, ranging from a ratio of nearly 2 to 1 (1,9,12, current study) to unity (3,6,10,11,19). While elevated T3 levels are typically observed (3,6,7,10,12), one study reported a four times greater frequency of low values than high ones (9). While elevated T3 levels are typically observed (3,6,7,10,12), one study reported a four times greater frequency of low values than high ones (9).…”