While a positive test strongly suggests GPA, it can occasionally appear in other conditions, such as Microscopic Polyangiitis (MPA) or during severe infections. This is why rheumatologists use this test as one tool within a comprehensive diagnostic framework.
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Therefore, the result is always interpreted alongside clinical symptoms and other diagnostic findings. GPA is a form of vasculitis that causes inflammation in the respiratory tract and kidneys.
A positive result indicates that the immune system is mistakenly producing these antibodies, which can attack healthy tissues and lead to inflammation. These antibodies are classified as antineutrophil cytoplasmic antibodies, or ANCA.
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However, it is important to note that a positive test does not automatically guarantee a diagnosis of GPA. A high titer, or concentration of antibodies, generally correlates with active disease, particularly in diagnosed patients.
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