Hello – Keep in mind that we aren’t allowed to interpret labs here, but a couple of general comments:
TPOAb is more commonly used to test for Hashi’s. If a patient is hypothyroid (*not* from taking too much ATDs), positive TPOAb can be used to make a diagnosis of Hashi’s. However, for Graves’ patients, a large percentage also happen to test positive for these antibodies, so it is not considered diagnostic.
TRAb is specific to Graves’ and measures both blocking and stimulating antibodies. TSI picks up *just* the antibodies that are causing stimulation.
Hope this helps!