The urine protein creatinine ratio and the 24-hour urine protein quantification are not the same, but they are correlated.
24-hour urine protein is the gold standard for detecting urinary protein. The process of retaining 24-hour urine is cumbersome, and the uncertainty of specimen collection is an important factor affecting test results. To simplify the urine retention method, spot-time urine (morning urine or random urine) is used instead of 24-hour urine to detect urinary protein.
The protein concentration in point-in-time urine specimens is affected by body hydration (i.e., the urine specimen may be diluted or concentrated), whereas the body’s excretion of creatinine is usually constant throughout the day; therefore, urine creatinine is usually measured at the same time to correct for the concentration of the urine and is expressed as urine protein concentration/creatinine. The urine protein creatinine ratio and the 24-hour urine protein quantification are highly correlated.
Patients with abnormal urine protein creatinine ratio and 24-hour urine protein quantification should visit a hospital and be treated under the guidance of a medical professional.