Urea Blood Test -- Evaluate Kidney and Liver Health
When proteins are metabolised, the liver converts the resulting amino acids into urea, which enters the bloodstream and is transported to the kidneys for excretion. Healthy kidneys remove more than 90 % of the urea the body produces, so blood urea levels serve as a practical indicator of renal performance. Because urea production depends on the liver, the test can also flag liver dysfunction.
Why Test Urea?
Testing urea helps uncover kidney or liver problems at an early stage. It is useful if a previous result was out of range, if you have symptoms related to the kidneys or liver, or as part of a routine health check to identify lifestyle-related risk factors before they become serious.
What Do High Urea Levels Mean?
Elevated urea usually points to impaired kidney function. Acute or chronic kidney disease, reduced blood flow to the kidneys (from heart failure, shock, or dehydration), gastrointestinal bleeding, high protein intake, and severe burns can all raise levels.
What Do Low Urea Levels Mean?
Low urea is uncommon and generally not a cause for concern. It can occur with liver disease, malnutrition, or during pregnancy. Persistently low values may warrant further investigation.
Symptoms to Watch For
- Fatigue and weakness
- Nausea or loss of appetite
- Decreased urine output
- Swelling in the extremities
- Confusion or difficulty concentrating
Who Should Get Tested?
- People with known or suspected kidney disease
- Individuals with liver conditions
- Those experiencing unexplained fatigue or swelling
- Patients on medications that may affect kidney function
- Anyone wanting a routine kidney health check
How to Prepare for Your Test
No special preparation is required. Bring a valid ID to the sampling centre.
Order Your Blood Test
Test your Urea levels with an accredited Swedish laboratory. Results within days, reviewed by Wellth.
Frequently Asked Questions
Does diet affect urea levels?
How is urea different from creatinine?
Can medications affect my urea levels?
Reviewed by
Wellth Team
Wellth
Our content is written and reviewed by Wellth, and fact-checked against peer-reviewed research and current Swedish clinical guidelines.
Learn more about our team →Medical Disclaimer
The information on this page is provided for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Wellth provides health information and testing services but is not a substitute for clinical care. Always consult a qualified healthcare provider if you have questions about a medical condition. If you are experiencing severe or urgent symptoms, contact your doctor or call 1177 Vårdguiden. Blood test results should be interpreted by a qualified healthcare professional in the context of your complete medical history.