BUN stands for blood urea nitrogen which measures the amount of urea
nitrogen, a waste product of protein metabolism, in the blood. Urea is
formed by the liver and carried by the blood to the kidneys for
excretion. Because urea is cleared from the bloodstream by the kidneys, a
test measuring how much urea nitrogen remains in the blood can be used
as a test of renal function. However, there are many factors besides
renal disease that can cause BUN alterations, including protein
breakdown, hydration status, and liver failure.
* Adult: 7-20 mg/100 ml; men may have slightly higher values than women
* Pregnancy: values decrease about 25%
* Newborn: values slightly lower than adult ranges
* Elderly: values may be slightly increased due to lack of renal concentration
##BUN:creatinine elevation: causes ABCD:
- Azoremia (pre-renal)
- Bleeding (GI)
- Catabolic status
- Diet (high protein parenteral nutrition)
- Azotremia (pre-renal)
- Bleeding (GI)
- Catabolic status
- Diet (high protein parenteral nutrition)
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