A 24-hour urine test is a laboratory diagnostic procedure in which all urine passed by a patient over a full 24-hour period is collected and analyzed. This test helps assess how well the kidneys are functioning and measures the levels of various substances such as protein, creatinine, hormones, electrolytes, and other metabolites in the urine. It is commonly recommended for detecting and monitoring conditions like kidney disorders, kidney stones, hormonal imbalances, and metabolic diseases. The test provides more accurate results than a single urine sample because it reflects the body’s daily output rather than a single moment in time.