![]() ![]() If the kidneys are damaged and not functioning properly, urea and the nitrogen it contains are not filtered fully from the blood. The BUN level in the blood is, therefore, stable. If all is going well, there is a continuous amount of urea being produced and being excreted by the kidneys into the urine. Urea is filtered out of the blood by the kidneys. The liver transforms ammonia into urea to make it less toxic and sends the urea out into the bloodstream. This produces nitrogen-containing ammonia as a byproduct, which is excreted into the bloodstream. Your cells break protein down into amino acids to build back up into the proteins they need for various processes. You get protein from the food you eat, and it enters the bloodstream from the intestines to be used by cells throughout your body. BUN is a waste product of cell metabolism. Your blood urea nitrogen (BUN) level is based on a blood test that measures the amount of urea nitrogen in your blood. Over time, this may lead to serious health problems, including high blood pressure, anemia, and heart disease. When your kidneys are not working well, your BUN level goes up. But for the most part, your kidneys get rid of it by flushing it out of your body through urine. When your kidneys are healthy, they remove the BUN, usually leaving a small amount of it in the blood. It forms in your liver and travels through your blood to your kidneys, which then filter it out of your blood. It develops when your body breaks down the protein in the foods you eat. ![]()
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