Hi. I wondered if anyone knows why a thyroid urine test that I had done quite a while back shows high T3 and T4 and yet my blood serum tests always show low T3 no matter what dose and combo of thyroid hormones I take. I barely convert T4 and don't tolerate T3 very well and have tried to identify the reasons why I can't tolerate T3 and rectify but to no avail. I've been ill for years. I just read an old post where a lady had blood thyroid done and levels were reasonable and yet her urine thyroid results showed very low T3. Her doc said that the urine results prove she's not converting and getting T3 into cells. What I can't figure out is how my urine levels for thyroid are high and blood not high. I am very sick, bed bound and also have lyme, viruses, suppressed immune, gut issues, disabled - it goes on and on. I'd love to crack this mystery. I wonder if it because my T3 is just going straight through my body and my receptors are not working. Could that be the case and if so, how do I get thyroid receptors to work. I'm emaciated and severely fatigued and need to try and continue fighting as riddled with lyme too. Can hardly eat or put on weight etc. There must be an answere - I've been searching for years - just can't fathom it out. Thanks if anyone knows anything about this.