P-ANCA stands for Perinuclear-Antineutrophil Cytoplasmic Antibodies. This test is also known as the MPO test where MPO stands for Myeloperoxidase. This test is performed via the ELISA method. This test helps to detect, diagnose, and monitor forms of systemic vasculitis. The P-ANCA (MPO)- ELISA test is done: • In case of symptoms such as fever, muscle aches, and weight loss • In case of impaired kidney or lung function • In case of symptoms of inflammatory bowel disease such as persistent or intermittent diarrhea, and abdominal pain • To distinguish between Ulcerative colitis and Crohn’s disease