Can low total T3 levels cause symptoms of low testosterone?? I have symptoms of low t but i don't know if there related to testosterone because I have normal levels. Total testosterone is 645ng/dl and free restoserone is 17.6 pg/ml from a range of 9.3-26.5. I got estradiol measured a couple times and it came pack at 30 pg/ml once and 36pg/ml the second time. My thyroid test showed TSH being normal below 2 and fee t4 was perfectly in range. My total T3 however was low and 72 and the range was 76-181. So I am wandering if my symptoms are caused by my low t3 level, estrogen, or testosterone ? would love to hear what you think! thanks!