I am on 100mg of levothyroxin, but my blood tests have confused me. I used to take NDT and always had a suppressed TSH at near zero. I knew that usually happens on NDT and I have expected it.
Early last year my GP persuaded me to try Levothyroxin by itself and I haven't noticed any difference, to be honest, and we agreed to a six monthly blood test. So, after 6 months on 100mg thyroxin my free T4 was 15.8 and TSH was 0.93.
The next six month blood test came back last week and my free T4 was 14.4 and TSH 0.69. My question is why has my TSH gone down still on the same amount of Levo? If anything, surely it should have gone up, especially as my T4 was lower.
My TSH has never been high. Even when I was diagnosed in 2006 it was only 4.85 and my T4 was 12, but I was very swollen with fluid retention (myoedema?).
Your thoughts are appreciated.