About Protein (Urine)
Persistent protein in the urine (proteinuria) is one of the most important warning signs of kidney disease — a healthy kidney retains virtually all protein from the blood, so protein in the urine signals that the filtering membranes are damaged. Proteinuria is a feature of diabetic nephropathy, hypertensive kidney disease, glomerulonephritis, and multiple myeloma. A dipstick positive result should be confirmed with a timed urine albumin-to-creatinine ratio for accurate quantification and monitoring.