A raised level of ANCA, CT scan and biopsy of the affected organs help to diagnose microscopic polyangiitis.
The following tests are used to diagnose MPA: Blood tests
: Blood tests show a raised ESR and increase in number of white blood cells. The level of an antibody called ANCA especially the MPOANCA type is raised
. Rheumatoid factor may be high in some patients. Patients with kidney disease may show an increase in blood urea nitrogen and creatinine levels in the blood.
: Urine may show protein, blood and sediments in MPA patients with kidney disease. Chest x-ray
: Chest x-ray may indicate if the lungs are affected. CT scan, mesentric angiography, endoscopy
: These tests may be useful if the digestive tract is affected. ECG
: ECG is useful if the heart is affected. EMG
: EMG is useful to diagnose nerve involvement. Biopsy
: Biopsy of the affected tissues helps in the diagnosis of MPA.