Evaluation of ANA testing in sytemic autoimmune dz (AID) finds low titers have low PPV. Highest PPV was for centromere pattern in PSS, w/ a PPV of 29% (1:160), 42% (1:32), 77% (1:640) & 82% (1:1280). Speckled PPV was low unti 1:1280 (PPV 71% for AID) https://t.co/JbDDXAOxOu