Question: what is the difference between gpa and mpa?
Answer: What are GPA and MPA? Granulomatosis with Polyangiitis (GPA) (formerly known as Wegener's Granulomatosis) and Microscopic Polyangiitis (MPA) are two types of ANCA-associated vasculitis, or AAV. AAV is a form of vasculitis that primarily affects the small blood vessels in your body.