Hi, I have RA and have been feeling dreadful for the last three years with little or no energy. I was referred to the thyroid UK website by someone on RA website and I went through the check list and I have 75% of the symptoms. I asked my GP for a test as about 10 years ago I was diagnosed as having an under-active thyroid and was put on thyroxin but when I moved and changed GP surgery they said I was only slightly under-active and took me off it. My latest blood test last week showed my TSH level at 0.31 which when I rang for results receptionist said was normal and no action. I have seen on this site and various others different normal ranges , what is a normal TSH range? My FT4 was 16 and my thyroid antibodies was 50. I don' understand the results and any advice would be appreciated.
Thanks
Donna