What laboratory finding is often seen in patients with chronic kidney disease?

Protein in urine is a hallmark laboratory finding in patients with chronic kidney disease (CKD). As the kidneys become damaged or lose function, they often allow proteins, which are normally retained in the bloodstream, to leak into the urine. This condition, known as proteinuria, serves as an important indicator of kidney damage. In healthy kidneys, filters called glomeruli prevent large molecules such as proteins from passing into the urine. When these filters are compromised, as seen in CKD, proteins such as albumin can be detected in the urine.

Monitoring protein levels in the urine is essential for assessing kidney health and progression of the disease. Proteinuria not only signifies that there is damage within the kidneys but can also contribute to further deterioration of kidney function if not addressed. Therefore, the presence of protein in urine is a crucial sign that helps healthcare providers evaluate and manage chronic kidney disease effectively.