Protein/Creatinine Ratio

A high urine protein-to-creatinine ratio means excess protein is being lost in urine, indicating kidney damage or increased glomerular permeability. Common causes include diabetes, high blood pressure, glomerular disease, infections or transient causes like heavy exercise. It signals need for repeat testing, kidney function tests (creatinine/eGFR), possibly urine albumin testing and specialist referral to determine cause and start treatment.

A normal urine protein-to-creatinine ratio (PCR) is generally under 15 mg/mmol (≈150 mg/g). PCRs of 15–50 mg/mmol indicate mild proteinuria; values above 50 mg/mmol are considered significant and require investigation. In pregnancy, a PCR ≥30 mg/mmol often defines clinically relevant proteinuria. Elevated PCRs prompt assessment for kidney disease or pre-eclampsia.

Reduce protein‑to‑creatinine ratio by controlling blood pressure (often with ACE inhibitors or ARBs), optimizing blood sugar in diabetes, limiting salt and excessive dietary protein, maintaining healthy weight and regular exercise, quitting smoking, avoiding NSAIDs, and treating infections. Lipid control and fluid management may help. Regular monitoring and follow‑up with your healthcare provider or nephrologist are essential to adjust therapy.

A urine protein-to-creatinine ratio of 2.5 indicates roughly 2.5 g of protein loss per day — markedly raised. It signals significant proteinuria, often from glomerular disease (eg, diabetic kidney disease or glomerulonephritis) and raises concern for progressive kidney damage. Prompt medical review is needed: repeat/confirmatory testing, urine albumin measurement, kidney function and blood pressure assessment, and likely nephrology referral.

Protein in urine (proteinuria) can occur at any stage of chronic kidney disease but often signals early damage when microalbuminuria appears in stages 1–2. Persistent or higher-level proteinuria usually indicates more advanced CKD and greater risk of progression (stages 3–5). Its presence prompts further testing (eGFR, albumin-to-creatinine ratio) and treatment (blood pressure control, glycemic management) to slow decline.

Be concerned if your urine albumin-to-creatinine ratio (ACR) is persistently elevated — ≥30 mg/g (≈3 mg/mmol) suggests abnormal proteinuria and >300 mg/g (≈30 mg/mmol) is severe. Worry sooner if levels rise over time, repeat tests remain abnormal, or you have diabetes, high blood pressure, swelling, reduced urine output, or unexplained fatigue. See your doctor for abnormal or worsening results.