What is this test?
Urea is a substance formed by the breakdown of proteins in the body and excreted by the kidneys. It is used together with creatinine to evaluate kidney function; it can also be affected by inadequate fluid intake and a high-protein diet.
When is it requested?
Monitoring of chronic kidney disease, assessment of nitrogen balance
What does a high Urea result mean?
High urea (BUN) is often linked to not drinking enough fluids or a high-protein diet; it can also rise when the kidneys filter less effectively.
- Fluid loss from low water intake, diarrhea, vomiting or heavy sweating (dehydration)
- High-protein diet or protein supplements
- Certain medicines (e.g., diuretics, corticosteroids)
- Fever, severe infection or significant tissue breakdown
- Reduced blood flow to the kidneys due to heart failure
- Bleeding in the stomach or intestines
- Acute or chronic kidney failure
What does a low Urea result mean?
Low urea is usually not significant; it most often reflects a low-protein diet or high fluid intake and only rarely points to liver disease.
- Low-protein or vegetarian diet
- High fluid intake
- Pregnancy (increased blood volume)
- Malnutrition or poor absorption
- Advanced liver disease (reduced urea production)
My result is outside the reference range. What should I do?
Urea is interpreted together with creatinine and eGFR, not alone. Come to the test well hydrated; if it is high, your doctor may repeat it or order further tests.
Reference ranges depend on the method, age and sex; always use the range printed on your report. This information is for general guidance only; consult your doctor for diagnosis and treatment.
Sample information
- Sample type: Serum
- Tube / container: Yellow-top tube
- Sample volume: 1 mL
Preparation
Fasting sample recommended.
Testing and results
- Method: Spec
- Run schedule: Daily
- Turnaround time: 3 hours
Price and appointment
Add the test to your list to receive a price quote by e-mail, or call +90 850 640 07 30 / message us on WhatsApp (+90 537 301 22 14). You can have the test done at our branches or with our home blood collection service. Results can be viewed online with your Turkish ID number (or passport number for foreign nationals).