What is the blood urea nitrogen (BUN) test?

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A blood urea nitrogen (BUN) test measures the amount of urea nitrogen in your blood. Levels of urea nitrogen is one marker on how well your kidneys are working. This is a simple test done by drawing blood out of your body through a vein in your arm.

Urea is a waste product formed in the liver that travels through your blood to the kidneys, which then filters it out of the blood. It is then carried out of your body through urine. A small amount of urea in your blood is normal because this process is ongoing. Too much urea shows that it is not being filtered out properly and may indicate a possible problem with the kidneys.

Why is blood urea nitrogen (BUN) test done?

A BUN test is a routine test ordered by your doctor during your checkup as part of a comprehensive metabolic panel (CMP) or basic metabolic panel (BMP). It will be done if you are admitted to an emergency room or during a regular hospital stay.

The BUN test may also be ordered as a precaution if you have risk factors for kidney disease. Early kidney disease doesn’t have symptoms, but the following factors can put you at higher risk:

• Family history of kidney disease
• Heart disease

The BUN test is often ordered if the doctor suspects your symptoms are signs of kidney disease. These include:

• Fatigue
• Frequent urination or not often enough
• Urine that is discolored or unusual (bloody, foamy, coffee-colored)
• Swelling around the eyes or on the face, belly, arms, legs, or feet
• High blood pressure

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BUN

BUN

BUN

Blood urea nitrogen. A measure of serum urea, a by-product of the breakdown of blood, muscle and protein. Urea is cleared by the kidney; diseases that compromise renal function lead to increased BUN.

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Increased in
Renal disease, dehydration, CHF, GI bleeding, starvation, shock, urinary tract obstruction (e.g., by tumour or prostate gland).
Decreased in
Liver disease, malnutrition or a low-protein diet.
Ref range
Women 6–20 mg/dL; men 8–23 mg/dL; SI expresses nitrogen as urea—normal adults, 2.9–8.2 mmol/L; BUN/creatine ratio normally is 20:1.

BUN

Blood urea nitrogen Nephrology A measure of serum urea, a by-product of the breakdown of blood, muscle and protein; urea is cleared by the kidney, and diseases which compromise the function of the kidney will frequently lead to ↑ blood levels Normal range 7–20 mg/dL ↑ in Renal disease, dehydration, CHF, GI bleeding, starvation, shock, urinary tract obstruction–by tumor or prostate gland ↓ in Liver disease, malnutrition or a low protein diet Ref range ♀ 6–20 mg/dL; ♂ 8–23 mg/dL; SI expresses nitrogen as urea–normal adults, 2.9-8.2 mmol/L; BUN/creatine ratio normally is 20:1. See Azotemia, Uremia.

BUN

Bun Blood Test

BUN

Acronym for blood urea nitrogen. This is estimated when kidney function is in question.

Blood urea nitrogen (BUN)

BUN

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