The 24-Hour Urinary Protein test is a quantitative measure of the total amount of protein excreted in the urine over a full 24-hour period. It's an important tool for diagnosing and monitoring kidney health. 🔎 Purpose and Principle Purpose: To detect and quantify proteinuria (excess protein in the urine). The kidneys normally filter blood, reabsorbing almost all protein; large amounts of protein in the urine suggest kidney damage or disease. Principle: The test requires collecting all urine produced over 24 hours to account for the natural daily fluctuations in protein excretion. This provides the most accurate measure of total daily protein loss.