24-Hour Urine Protein Test
Category
Nephrology
Specimen
Urine (24h collection)
Organ System
Kidney & Urinary Tract
Available At
1 lab
About 24-Hour Urine Protein Test
A 24-hour urine protein test measures the total amount of protein lost in your urine over a full day. Healthy kidneys filter waste but retain protein; when filters are damaged or under strain, protein leaks into urine (proteinuria). The test quantifies the loss and is used to diagnose and monitor kidney disease, pre-eclampsia in pregnancy and other conditions.
Normal protein excretion is below about 150 mg per day. Values of 150–500 mg/day are mild, 500–3,500 mg/day moderate, and above 3,500 mg/day (about 3.5 g) is in the nephrotic range, which usually causes swelling, low albumin and high cholesterol. In pregnancy, 300 mg or more in 24 hours supports a diagnosis of pre-eclampsia when blood pressure is high.
A urine protein-to-creatinine ratio on a single spot sample is often used instead, since it is more convenient and correlates well. Accurate 24-hour collection is essential: missed samples make the result unreliable, and the lab measures creatinine in the sample to check completeness.
When Should You Get 24-Hour Urine Protein Test
A 24-hour urine protein test is commonly advised for:
- Protein or foam in urine.
- Swelling of the legs, face or abdomen.
- Suspected pre-eclampsia in pregnancy.
- Diabetic and hypertensive kidney disease.
- Monitoring nephrotic syndrome and kidney treatment.
Conditions 24-Hour Urine Protein Test Can Detect
Raised protein loss may be associated with:
- Glomerulonephritis and nephrotic syndrome.
- Diabetic kidney disease and hypertension.
- Pre-eclampsia.
- Lupus nephritis and multiple myeloma.
How to Prepare for 24-Hour Urine Protein Test
- Start in the morning: empty your bladder and discard that urine, noting the time.
- Collect all urine for the next 24 hours in the container provided, kept cool.
- Empty your bladder at the end of 24 hours and add it to the container.
- Avoid heavy exercise and tell your doctor about medicines.
24-Hour Urine Protein Test Normal Reference Ranges
| Protein in 24 hours | Interpretation |
|---|---|
| Below 150 mg | Normal |
| 150 – 500 mg | Mildly raised |
| 500 – 3,500 mg | Moderately raised |
| Above 3,500 mg | Nephrotic range |
Results need clinical interpretation.
Further reading: MedlinePlus – Lab tests, Mayo Clinic – Tests & procedures, Cleveland Clinic – Diagnostics, Lab Tests Online. Values are approximate and may vary by laboratory; this page is general information, not medical advice.
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Frequently Asked Questions About 24-Hour Urine Protein Test
What if I miss part of the collection?
Tell the lab; the test may need repeating.
Is spot ratio as good as 24 hours?
It is often an acceptable alternative.
Does exercise raise urine protein?
Yes, temporarily.
Medical Disclaimer: This page is for informational purposes only and does not constitute medical advice. Lab test results should always be interpreted by a qualified healthcare professional in the context of your clinical history. Do not self-diagnose or alter your treatment based on test results alone.
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