https://www.selleckchem.com/pr....oducts/3-3-cgamp.htm
About 5-10% of patients with autoimmune hemolytic anemia (AIHA) and a negative result on the direct antiglobulin test (DAT) are difficult to diagnose. Most of these patients with AIHA have red blood cell-associated IgG levels below the cut-off value of DAT. Comprehensive diagnosis and classification of DAT-negative AIHA can be made with additional tests of low-affinity IgG and IgA/IgM autoantibodies. However, 17% of patients with DAT-negative AIHA show negative results on all these tests and are diagnosed with "clinically diagnosed DA
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