Autoimmune inflammation of small blood vessels with ANCA antibodies — often rapidly progressive glomerulonephritis.
ANCA vasculitis (GPA, MPA) commonly hits kidneys and lungs: rapidly rising creatinine, hematuria, and proteinuria with pulmonary hemorrhage possible. It is a medical emergency — urgent immunosuppression (rituximab or cyclophosphamide with steroids) can salvage kidney function. Relapse is monitored with ANCA titers and urine.
Glomerulonephritis with rapid loss of kidney function over days to weeks — a nephrology emergency.
Blood in the urine — visible (gross) or microscopic — with causes ranging from infection and stones to glomerulonephritis and malignancy.
Inflammation of the kidney's filtering units (glomeruli) - a diverse family of diseases often presenting with blood and protein in urine.
A sudden drop in kidney function over hours to days - reversible if caught early, but a major risk factor for chronic kidney disease.
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This content is a general reference, not medical advice, a diagnosis, or a treatment plan. Do not change your diet, fluids, medicines, or dialysis plan without your nephrologist or renal dietitian. Individual recommendations depend on your labs, medications, conditions, and care plan.