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Blood Urea Nitrogen Low

The blood urea nitrogen or BUN is a blood test that measures the amount of urea nitrogen in the bloodstream. It reflects how well your kidneys are. When a person is dehydrated, false results might be obtained as BUN levels increase when blood is concentrated. Elevated BUN levels indicate dehydration, excessive protein intake and impaired renal function. Low BUN levels indicate over hydration, liver damage and malnutrition.


Creatinine is a waste product produced by muscle metabolism. Kidneys filter creatinine to be excreted through the urine and the renal function is reflected. Elevated levels indicate renal impairment. The opposite happens for urinary creatinine clearance; during renal impairment, urinary creatinine is extremely low. Measuring urinary creatinine clearance during unilateral kidney impairment is insignificant as the healthy kidney can still excrete creatinine through the urine.


Ammonia is a waste product produced during the synthesis of protein. The liver converts ammonia into urea so it could be excreted out of the body. When there is an abnormally high ammonia levels in the blood, liver impairment should be suspected. In preparing for ammonia plasma test, the person being tested should refrain from smoking several hours prior to the test. Potassium salts, antibiotics and alcohol may also alter ammonia levels in the blood.


Sodium and chloride are the two important electrolytes in maintaining body fluid balance. Normal sodium range is between 130-145 mEq/L while chloride is between 95-100 mEq/L. Correct levels of sodium and chloride in the blood help in maintaining normal osmotic pressure, acid-base balance and nerve impulses.


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What you have to become familiar with creatinine levels with references to renal disease. A very high creatinine level is much worse than a lowered level, especially when the BUN is higher as well.


non-protein-nitrogen-9-638.jpg (638×479)Blood Urea Nitrogen A blood urea nitrogen (BUN) test measures the amount of nitrogen in your blood that comes from the waste product urea. Urea is made when protein is broken down in your body. Urea is made in the liver and passed out of your body in the urine. A BUN test is done to see how well your kidneys are working. If your kidneys are not able to remove urea from the blood normally, your BUN level rises. Heart failure, dehydration, or a diet high…