Am taking Synthroid for thyroidsim; have had rai surgery so no thyroid at all. t4s too high, ft4 midrange but t3 out of low range at 18 (22-35.) TSH is up to 1.65. I figure endo will raise tsh but not give t3 meds. Are the levels dangerous? I'm sure they will go up a bit with the synthroid raised to 150 (which I assume he will be doing) but not much.