Protein in the urine (proteinuria) reflects how well the kidneys are filtering and retaining essential proteins. Under normal conditions, little to no protein should pass into urine. Even small, persistent elevations—especially albumin—can signal early changes in kidney function or vascular health, often before other labs become abnormal. In otherwise healthy individuals, transient increases can occur after exercise, dehydration, or illness, but sustained proteinuria is more meaningful and may reflect subtle endothelial or metabolic stress.
Lab metric
Protein (Urine)
Protein (Urine) is a laboratory measurement that detects the presence of protein in the urine, indicating how effectively the kidneys filter blood. Higher levels, known as proteinuria, can suggest early kidney stress, vascular changes, or metabolic strain, while very low or absent protein is normal and reflects healthy filtration. Persistent elevations may be driven by conditions such as hypertension, diabetes, dehydration, intense exercise, or certain medications, whereas temporary spikes can occur after illness or strenuous activity and usually resolve. This metric falls under the Kidney & Urinary category and is part of the lab metric panel.


