While a BUN test helps diagnose certain diseases, especially revolving around kidney function, it can also highlight imbalances or injuries affecting blood circulation in the renal area. High BUN levels indicate various medical conditions and may suggest certain lifestyle adjustments. This can be determined by symptoms of kidney disease, which include the following: If your doctor suspects kidney disease, a BUN test, together with other related tests, will be requested. Beyond the upper limit (>20 mg/dL), your BUN level is considered abnormally high. Normal BUN levels should be between 6 to 20 milligrams per deciliter (mg/dL). While BUN levels reveal critical information about your renal function, it does not warrant a direct diagnosis of any condition unless taken without the other kidney function tests. If this is not the case, you could be experiencing conditions like dehydration, urinary tract obstruction, or gastrointestinal bleeding. Urea nitrogen is a chemical waste product that the kidneys remove from the body. Specifically, a BUN test measures the amount of urea nitrogen in the blood. Your doctor may ask for a blood urea nitrogen or BUN test as part of the lab work for assessing your kidney function. What Is a Blood Urea Nitrogen (BUN) Blood Test? But it is also usually included in test panels along with other blood tests that check your overall health, like the CMP 14 blood test. If you have a BUN between 100 mg/dL to 250 mg/dL, it could be due to severe kidney dysfunction, specifically involving its ability to filter waste products.ĭid You Know? You can take a BUN test as an independent lab test. However, a dangerously high BUN level, often starting from 50 mg/dL, indicates kidney damage that should be addressed immediately. Test values beyond 20 mg/dL in a BUN test are considered abnormal and can be due to various factors. Your blood urea nitrogen (BUN) levels provide valuable information about your kidneys that help diagnose diseases such as uremia and CKD.
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