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Protein in Urine

Published: July 27, 2026Updated: August 25, 2026

This biomarker measures the amount of protein present in a urine sample, which can indicate kidney damage or dysfunction.

Quick summary

Protein in urine is a key indicator of potential kidney issues.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
mg/dL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche Urine Protein, Abbott Urine Protein
interpretation: {"text":"0–15 mg/dL: Normal range, indicates healthy kidney function.","label":"Normal"}; {"text":">15 mg/dL: May indicate kidney damage or other health issues.","label":"Elevated"}

Protein in urine, also known as proteinuria, is a critical biomarker used to assess kidney health. Normally, the kidneys filter waste products into the urine while keeping essential proteins in the blood. However, when the kidneys are damaged, they may allow proteins to leak into the urine.

A urine protein level above the reference range (0–15 mg/dL) can signify various conditions, including chronic kidney disease, glomerulonephritis, and nephrotic syndrome. It is often used in conjunction with other tests to diagnose and monitor kidney function.

Early detection of elevated urine protein levels can lead to timely intervention and management of kidney-related conditions, potentially preventing further damage and complications.

Frequently asked questions

What causes elevated protein in urine?
Common causes include kidney disease, diabetes, hypertension, and certain medications.
How is proteinuria diagnosed?
Diagnosis is typically made through a urine test, often as part of a routine check-up or when symptoms of kidney disease are present.
  1. 1
    Mayo Clinic: Protein in UrineSource
  2. 2
    National Kidney Foundation: ProteinuriaSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy