The Urine Protein/Creatinine Ratio (UPCR)—also searched as urine protein creatinine ratio or urine protein/creatinine—is a urine test that estimates how much protein you are losing in your urine. Normally, healthy kidneys keep most protein in the bloodstream. When the kidney’s filtering units are irritated or damaged, protein can leak into the urine, a finding called proteinuria.

UPCR measures two things in the same urine sample:

• Urine protein (the amount of protein present)
• Urine creatinine (a natural waste product made by muscles that is released into urine at a fairly steady rate)

By comparing protein to creatinine, the test corrects for how concentrated or diluted your urine is. This makes UPCR an accurate, convenient alternative to a 24-hour urine collection for many patients.

What results generally mean: A higher UPCR suggests more protein is being lost in the urine and may indicate kidney damage or increased stress on the kidneys. A lower or normal UPCR suggests little to no abnormal protein loss. Your clinician will interpret your result using the lab’s reference range and your situation (age, pregnancy status, symptoms, medications, blood pressure, and kidney function tests like serum creatinine/eGFR). Mild elevations can sometimes be temporary (for example, after vigorous exercise, fever, dehydration, or a recent illness), so repeat testing may be recommended.

A clinician may order a UPCR to screen for, diagnose, or monitor proteinuria and to evaluate possible kidney disease. It’s often used because it can be performed on a single “spot” urine sample (commonly a first-morning sample), making it easier than collecting urine for 24 hours.

Common reasons to order a UPCR include:

• Signs or symptoms that could suggest kidney problems, such as swelling of the legs/ankles/face (edema), foamy urine, unexplained weight gain from fluid, fatigue, or reduced urination.
• Abnormal routine urine tests (dipstick protein positive) that need confirmation and better quantification.
• High blood pressure (hypertension), especially when new, difficult to control, or associated with other risk factors.
• Diabetes (type 1 or type 2), to help assess diabetic kidney involvement; UPCR may be used along with urine albumin testing depending on your clinician’s goals.
• Known chronic kidney disease (CKD) or suspected kidney damage, to monitor progression and response to treatment (for example, ACE inhibitors/ARBs).
• Autoimmune or inflammatory conditions that can affect the kidneys (such as lupus), to look for kidney involvement.
• Pregnancy, especially if there is concern for preeclampsia (typically high blood pressure after 20 weeks plus signs of organ involvement). UPCR is commonly used to help evaluate proteinuria in pregnancy quickly.
• Follow-up of kidney inflammation after infections or in suspected glomerular disease.

Your provider may repeat UPCR over time. Trends can be more informative than a single value—rising levels can suggest worsening proteinuria, while decreasing levels can indicate improvement or effective treatment.

• Chronic kidney disease (CKD)
• Diabetic kidney disease (diabetic nephropathy)
• Hypertensive kidney disease (nephrosclerosis)
• Glomerulonephritis (inflammation of the kidney filters)
• Nephrotic syndrome
• Lupus nephritis (kidney involvement from systemic lupus erythematosus)
• Preeclampsia (pregnancy-related high blood pressure with proteinuria/organ involvement)
• IgA nephropathy
• Kidney involvement from infections (e.g., post-infectious glomerulonephritis)

• Early detection of proteinuria and possible kidney damage
• Monitoring chronic kidney disease progression and treatment response
• Supporting diabetes care by assessing kidney complication risk
• Supporting blood pressure management by identifying kidney-related injury
• Pregnancy monitoring when evaluating for preeclampsia or kidney stress
• Guiding lifestyle and medication decisions to protect kidney function (e.g., salt reduction, BP control, medication adjustments)
• General wellness screening in higher-risk individuals (diabetes, hypertension, family history of kidney disease)