I have had an antibody test done at GPS as I requested it. He said I only needed one blood test. It came back negative. I thought there were 2 tests done for thyroid antibodies. I have had under active thyroid for 16 years now and never feel well even though I am on 50mcg of t3. No thyroxine as felt even worse. My gp said having antibodies test is a waste of time anyway it doesn't prove anything, I am confused, can anyone help.