Urine Protein / Creatinine Ratio

Function

The Urine Protein/Creatinine Ratio (UPCR) is a diagnostic tool used to estimate the amount of protein excreted in the urine over a 24-hour period using a single random urine sample. This test is vital because the concentration of protein in urine can fluctuate throughout the day based on hydration levels; by comparing protein levels to creatinine (a waste product excreted at a relatively constant rate), clinicians can obtain a normalized value.

Why it is Ordered

Physicians order a UPCR primarily to screen for, monitor, or diagnose kidney disease. It is often requested for patients with risk factors such as diabetes, hypertension, or systemic lupus erythematosus. It is also a critical component in screening pregnant women for preeclampsia, where sudden onset proteinuria can indicate a medical emergency.

Associated Conditions

• Chronic Kidney Disease (CKD): Persistent high levels indicate damage to the kidney's filtering units (glomeruli).
• Nephrotic Syndrome: Characterized by very high protein loss, swelling (edema), and low serum albumin.
• Preeclampsia: A pregnancy complication marked by high blood pressure and protein in the urine.
• Diabetic Nephropathy: Kidney damage resulting specifically from long-term diabetes management issues.