<prompt> Percentage of T4 and T3 released from thyroid gland?50 T4 ; 50 T325 T4 ; 75 T380 T4 ;20 T31000 T4 ;0 T,  <response>: Ans. is c i.e., 80 T4 ;20 T3 ,Ref: Elsefiers medical laboratory science examination review p.246Approximately 80 of secreted hormone is T4 20 T3 , . 