In this article 7 sections
A urine report showing protein can be worrying, especially when you feel well. Normally, only a small amount of protein passes into urine. Higher amounts may indicate that the kidneys’ filters are allowing protein to leak through, although some increases are temporary.
The medical term for excess protein in urine is proteinuria. When the protein being measured is albumin, the result is called albuminuria. Your doctor will look at the amount, whether it persists and what your other tests show.
Why does protein appear in urine?
Protein levels can rise temporarily after strenuous exercise or during dehydration, fever or an infection. This is one reason a doctor may recommend repeating a urine test before deciding what the result means. Tell your doctor if you were unwell when the sample was collected.
Persistent albumin leakage can occur with diabetes, high blood pressure or conditions that inflame the kidneys’ filters. It can be present even when the estimated glomerular filtration rate, or eGFR, is still within a relatively normal range. Blood and urine tests therefore provide different, complementary information about kidney health.
Would you notice any symptoms?
Many people have no symptoms and discover the result during a routine check-up. When symptoms occur, they may include persistently foamy urine, puffiness around the eyes or swelling of the feet and ankles.
The appearance of urine alone cannot confirm how much protein it contains or what is causing it. Mention persistent changes to your doctor, but rely on appropriate testing rather than trying to judge kidney health by the amount of foam.
How do doctors confirm the result?
A routine urine test may first detect protein using a dipstick. Your doctor may then request a laboratory measurement called the urine albumin-to-creatinine ratio, usually written as uACR or ACR. This compares albumin with creatinine in the same urine sample and gives a more useful measurement than a dipstick result alone.
Depending on the findings, a urine protein-to-creatinine ratio, or PCR, may also be used to measure total protein. These tests are related, but they are not interchangeable, so check which result appears on your report.
An early-morning sample is often preferred when confirming an abnormal result. Follow the collection instructions and tell your doctor about a recent urine infection, strenuous exercise or menstrual bleeding, because these can affect interpretation. Your doctor can advise whether testing should proceed or be repeated later.
What does the uACR number mean?
For adults, a uACR below 30 mg/g generally falls within the normal to mildly increased category. A result of 30 mg/g or more needs assessment and often repeat testing. Some laboratories use mg/mmol, where the corresponding guideline threshold is approximately 3 mg/mmol.
Always check the units before comparing reports. Your doctor will interpret the result alongside your eGFR, blood pressure, medical history and previous measurements; one urine result cannot explain the whole picture.
How is it treated?
Treatment focuses on the cause and on protecting the kidneys. This may include improving blood pressure or diabetes control and prescribing medicines that reduce albumin leakage and the risk of further kidney damage. The right approach depends on your results and overall health.
Food advice should also be individual. Protein in the urine is not a reason to remove all protein from your meals or start protein supplements to replace what is being lost. Ask your doctor what amount is appropriate and whether you need a personalised meal plan, including advice about salt.
What if protein is found during pregnancy?
During pregnancy, protein in urine needs review alongside blood pressure and other findings. It can be a sign of pre-eclampsia, a pregnancy-related condition that needs close medical attention. Protein alone does not establish the diagnosis.
If you are pregnant or have recently given birth and develop a severe headache, blurred vision, pain below the ribs or sudden swelling of the face or hands, seek immediate medical assessment. Do not wait for the next routine appointment or another urine test.
Keeping track of follow-up
Before leaving your appointment, ask when to repeat the test and whether any treatment needs to change. Keeping your urine and blood reports together helps your doctor compare results over time. A fall in urine albumin can be a useful sign that treatment is helping, even if the result has not returned to the usual range.