in order to investigate the effect of 3,5,3 ' l-triiodothyronine ( t3 ) administration on thyroid hormone concentrations in serum , thyroxine ( t4 ) , t3 , 3,3',5 ' l-triiodothyronine ( reverse t3 , rt3 ) and thyroid stimulating hormone ( tsh ) concentrations in serum were determined before and after t3 administration in 10 hypothyroid patients maintained on constant doses of t4 .
C0040165
thyroxine
C0020676
hypothyroid