Description

Blood Urea (BUN) reflects protein breakdown and kidney function. Elevated levels may arise from dehydration, high‑protein intake, gastrointestinal bleeding or renal impairment, while low values can reflect malnutrition or liver disease. Interpreting urea alongside creatinine offers a clearer assessment of filtration and perfusion. No fasting is required, though steady hydration is recommended. This test is commonly ordered for hypertension, diabetes or suspected kidney disease and before surgeries to gauge renal status.