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I need help understanding a Lupus blood test result

Hi and thank you in advance.  I just had a recent blood test called DNA (DS) AB, High Avidity that I've never heard of before. I've had several ANA and DNA (DS) but never this one. My last ANA was 1:160 Homogeneous and my DNA DS was 15. The DNA (DS) AB, High Avidity was < 12.3. No idea what that means, and Friday was my doctor's last day. I got my results from Quest Diagnostics. I'll be moving on to a new physician in 3 months, and like my other doctor, he is not a rheumatologist either. Can anyone help me understand the High Avidity test? Thanks again.
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