melamine
Senior Member
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Although the absence of GAD antibodies doesn't definitively rule SPS out
That's right. It is more common to see a majority % of a diagnosed condition test positive for a particular test associated with it than 100%, and it's frequently enough a slender one at that. Then too, as I recall, it was a pass/fail test without scaling that might potentially suggest a more nuanced interpretation, unlike some of the more common autoimmune antibody tests.