Proteinuria

The abnormal urinary excretion of increased amounts of protein, most commonly albumin, reflecting glomerular or tubular dysfunction and frequently serving as an indicator of underlying renal disease or systemic pathology. Possible causes are chronic kidney disease, glomerulonephritis, nephrotic syndrome, diabetic nephropathy, hypertensive nephropathy, lupus nephropathy, heart failure, urinary tract infection, and multiple myeloma.