My t4 is 15.6 and t3 5 tsh 6.2 on 25mg of Levi. How high can my t4 be before I'm over medicated? Also how high can my t3 be before I get hyper symptoms? I need to know because I've just asked the drs surgery for an increase in my Levo, as my Dr feels theres no need to take action with my results, I need some concrete reasons to debate an increase with him. Any help appreciated. P.s I m also due to attend a respiratory health clinic as I did a sleep study privately and I have sleep apnea and need to try c pap therapy.