ah ha...thanks! doubtful about the Graves. It was the TGab I couldn't remember.
If you're testing for Hashi's, you just need TPOab (thyroid peroxidase antibodies) and TGab (thyroglobulin antibodies) - get both as some of us are positive for one, some the other and some both. If you want to test for Grave's also (can't remember your circumstances), TSI (thyroid stimulating immunoglobulin) is the definitive test for Grave's.