Albuminuria is the presence of albumin, a protein, in the urine. This condition is often indicative of kidney damage or dysfunction, as the kidneys normally filter out waste products and excess substances, including proteins, from the blood. The presence of albumin in the urine can be a sign of kidney disease, diabetes, high blood pressure, or other underlying health issues. Monitoring and managing albuminuria is important in order to prevent further kidney damage and complications.