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Urea nitrogen levels tend to increase with age. Infants have lower levels than other people do, and the range in children varies. Generally, a high blood urea nitrogen level means your kidneys aren't working well. But elevated blood urea nitrogen can also be due to: Urinary tract obstruction; Congestive heart failure or recent heart attack; Gastrointestinal bleeding; Dehydration, resulting from not drinking enough fluids or for other reasons; Shock; Severe burns
In this Article. The blood urea nitrogen test, which is also called a BUN or serum BUN test, measures how much of the waste product you have in your blood. If your levels are off the normal range, this could mean that either your kidneys or your liver may not be working properly.
A BUN, or blood urea nitrogen test, can provide important information about your kidney function. The main job of your kidneys is to remove waste and extra fluid from your body. If you have kidney disease , this waste material can build up in your blood and may lead to serious health problems, including high blood pressure , anemia , and heart disease .
What is Blood Urea Nitrogen (BUN) ? BUN is a laboratory test that measures the amount of nitrogen in the blood that comes from urea. Urea is a waste product produced by the liver during protein metabolism. Protein metabolism produces ammonia, which is eventually converted to the less toxic waste product, urea.
As mentioned earlier, a BUN test alone will not help doctors diagnose a disease. Abnormal BUN test results will prompt the doctors to order creatinine tests and urine tests. The course of treatment for patients with abnormal blood urea nitrogen (BUN) test results depends on the cause and severity of the cause. Patients with organ failure will ...
Blood urea nitrogen (BUN) test, is a common blood test that can provide important information about how well your kidneys and liver are working. A blood urea nitrogen (BUN) test measures the amount of urea nitrogen that’s in your blood.
In medicine, the BUN-to-creatinine ratio is the ratio of two serum laboratory values, the blood urea nitrogen (BUN) (mg/dL) and serum creatinine (Cr) (mg/dL). Outside the United States, particularly in Canada and Europe, the truncated term urea is used (though it is still the same blood chemical) and the units are different (mmol/L). The units of creatinine are also different (μmol/L), and this value is termed the urea-to-creatinine ratio. The ratio may be used to determine the cause of acute kidney injury or dehydration. The principle behind this ratio is the fact that both urea (BUN) and creatinine are freely filtered by the glomerulus; however, urea reabsorbed by the tubules can be regulated (increased or decreased) whereas creatinine reabsorption remains the same (minimal reabsorption).
A basic metabolic panel (BMP) is a blood test consisting of a set of seven or eight biochemical tests and is one of the most common lab tests ordered by health care providers. Outside the United States, blood tests made up of the majority of the same biochemical tests are called urea and electrolytes (U&E or "Us and Es"), or urea, electrolytes, creatinine (UEC or EUC or CUE), and are often referred to as 'kidney function tests' as they also include a calculated estimated glomerular filtration rate. The BMP provides key information regarding fluid and electrolyte status, kidney function, blood sugar levels, and response to various medications and other medical therapies. It is frequently employed as a screening tool during a physical exam. The basic metabolic panel is a simpler version of the comprehensive metabolic panel (CMP), which includes tests for liver function.
Blood urea nitrogen (BUN) is a medical test that measures the amount of urea nitrogen found in blood. The liver produces urea in the urea cycle as a waste product of the digestion of protein. Normal human adult blood should contain between 6 and 20 mg of urea nitrogen per 100 ml (6–20 mg/dL) of blood. Individual laboratories will have different reference ranges as the assay used can vary between laboratories.