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Protein in Urine
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

Protein in Urine

A protein in urine test measures the amount of protein in your urine to help detect kidney damage or other health conditions.

What is a protein in urine test?

This test measures the amount of protein in your urine. Normally, you have very little protein in your urine. A large amount, known as proteinuria, may indicate a kidney problem. Your kidneys are responsible for filtering waste and extra water from your blood; when they are healthy, tiny filters prevent large protein molecules from leaking into your urine. High protein levels over time can be an early sign of kidney disease or damage.

What is it used for?

This test is often part of a urinalysis, which checks your general health and the health of your urinary tract. It is used to diagnose or monitor kidney disease and other health problems.

Why do I need a protein in urine test?

Your provider may order this test during a routine checkup, to monitor a known kidney condition, or if you have symptoms of kidney disease. Because chronic kidney disease may not show symptoms until later stages, you may need testing if you are at high risk. Symptoms of kidney disease can include:

  • Swelling in the hands, feet, or puffy eyelids
  • Dry skin, itching, or numbness
  • Fatigue
  • Changes in urination frequency
  • Bloody or foamy urine
  • Loss of appetite and weight loss
  • Muscle cramps
  • Nausea and vomiting
  • Shortness of breath
  • Sleep problems or trouble thinking clearly

You are at higher risk for kidney disease if you have a family history of the condition, diabetes, high blood pressure, or heart disease. Additionally, long-term use of certain medicines, such as nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or naproxen sodium, can damage your kidneys.

What happens during a protein in urine test?

You will need to provide a urine sample. A health care professional will provide a cleansing wipe, a container, and instructions for the "clean catch" method to ensure germs from your skin do not contaminate the sample.

Frequently Asked Questions

Normal urine typically contains less than 150 milligrams of protein per day. Lab reports often use different measurements, such as milligrams per deciliter (mg/dL) for a single sample or milligrams per gram of creatinine (mg/g) for a ratio test. A result of 30 mg/g or less is generally considered normal, while levels above 300 mg/g may indicate significant kidney damage. Always compare your specific result to the reference range provided by your laboratory, as these can vary slightly.
Drinking excessive amounts of water immediately before the test can dilute your urine, potentially leading to a falsely low protein reading. Conversely, severe dehydration can concentrate the urine and make protein levels appear higher than they are. It is best to maintain your normal fluid intake and avoid drinking large quantities of water right before providing the sample. If you are instructed to provide a first-morning urine sample, this is often preferred because it is the most concentrated and provides the most accurate baseline.
single elevated result does not automatically mean you have chronic kidney disease. Transient proteinuria can occur due to fever, intense exercise, stress, dehydration, or a urinary tract infection. Your provider will likely repeat the test or order a 24-hour urine collection to confirm if the protein leakage is persistent. If elevated levels are confirmed over time, further evaluation for underlying causes like diabetes or high blood pressure will be recommended.
Managing blood pressure and blood sugar levels is the most effective way to reduce protein leakage. This includes following a low-sodium diet, maintaining a healthy weight, and taking prescribed medications consistently. Avoiding nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or naproxen is also crucial, as these can worsen kidney function. Regular monitoring and adherence to your care plan are essential to prevent further damage.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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