Albuminuria is a sign of kidney disease and means that you have too much albumin in your urine. Albumin is a protein found in the blood. A healthy kidney doesnât let albumin pass from the blood into the urine. A damaged kidney lets some albumin pass into the urine. The less albumin in your urine, the better. Sometimes albuminuria is also called proteinuria. A healthy kidney doesnât let albumin pass into the urine. A damaged kidney lets some albumin pass into the urine.