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BUN (Blood Urea Nitrogen) Levels for Stages of Kidney Disease

2014-11-20 11:33| Font Size A A A

BUN (Blood Urea Nitrogen) Levels for Stages of Kidney DiseaseBUN, or blood urea nitrogen is a test performed on a blood sample as an indirect test of your kidney function. BUN values can indicates how efficiently your kidneys are working. According to its levels, we can make a preliminary judgment what kidney disease stages are you in.

What is the “Blood Urea Nitrogen (BUN)” ?

As I said at the beginning, blood urea nitrogen is an indication of renal (kidney) health. Urea nitrogen is nitrogenous end product of metabolism and urea is the primary metabolite derived from dietary protein and tissues protein turnover.

What’s the normal range of BUN?

There is a general number of BUN which can as your reference (different countries have different values). In medical, the normal range of urea nitrogen in blood is 3.2~7.1mmol/L or 9~20mg/dl. If your BUN test shows that its level is much higher than the normal range, it has a high risk to indicate there is something wrong with your kidneys.

BUN levels for stages of kidney disease.

But since our kidney has a strong compensatory ability and half of renal function can guarantee our body health. In other words, when kidney function or glomerular filtration rate (GFR) declines to 50% or more less, BUN will increase. Therefore, for acute kidney failure, BUN test can not be the index of early stage of renal disease. But for Chronic Kidney Failure, the BUN levels mean the degree of your kidney damage.

Kidney failure compensatory period (GFR≤50), BUN is less than 9mmol/L.

Kidney failure decompensation period, BUN level is more than 9mmol/L.

Kidney failure stage, BUN level is more than 20mmol/L.

Through the above description, you can clearly see that different BUN levels stands for the different stages of kidney disease. If your high BUN level is induced by kidney damage, the correct and effective treatment should be applied as soon as possible. If you have no idea about how to deal with your condition, welcome to consult us: renal-disease@hotmail.com or ask our online doctors directly.



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