Whether anti-glomerular basement membrane antibody <2IU/mL is normal is related to its value and reference range. Usually, the normal value of anti-glomerular basement membrane antibody is 0, and the normal range of some laboratories is 0-20 IU/mL. If the value is 0 or the reference range is 0-20 IU/mL, it is normal; if the value is between 0 and 2 IU/mL, and the reference value is 0, it is not normal. Anti-glomerular basement membrane antibody refers to an antibody in the serum that will attack the basement membrane and has a normal value of 0 and is negative. Its normal range in some laboratories is 0-20 IU/mL. If the value is 0 or the reference range is 0-20 IU/mL, it is normal; if the value is between 0 and 2 IU/mL and the reference value is 0, it is abnormal. It is recommended to consult the local hospital. Anti-glomerular basement membrane antibody binds to anti-glomerular basement membrane antigen to induce complement activation and cause disease. It makes the permeability of the basement membrane increase, and a large amount of proteinuria can occur, which leads to kidney injury. Subsequently, it may even lead to acute progressive nephritis. If patients find abnormal anti-glomerular basement membrane antibodies, it is recommended to go to regular hospitals in time and standardize the treatment under the guidance of doctors.