What causes high BUN and low Creatinine?

High BUN and low Creatinine can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your Creatinine is in between 0.9 mg/dL and 1.3 mg/dL then you need not worry as these are the normal ranges for BUN and Creatinine respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Normal range of BUN : 6 - 20 mg/dL

Ideal values of BUN depending on age :

Age	Ideal BUN value
<5 years	6.063
5-10 years	6.126
10-15 years	6.19
15-20 years	6.254
20-25 years	6.319
25-30 years	6.385
30-35 years	6.452
35-40 years	6.519
40-45 years	6.587
45-50 years	6.656
50-55 years	6.725
55-60 years	6.795
60-70 years	6.866
70-80 years	6.938
80-90 years	7.01
90-100 years	7.083
>100 years	7.157

*Ideal values are calculated based on our database of patient records

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Normal range of Creatinine : 0.9 - 1.3 mg/dL

Ideal values of Creatinine depending on age :

Age	Ideal Creatinine value
<5 years	0.909
5-10 years	0.918
10-15 years	0.928
15-20 years	0.938
20-25 years	0.948
25-30 years	0.958
30-35 years	0.968
35-40 years	0.978
40-45 years	0.988
45-50 years	0.998
50-55 years	1.008
55-60 years	1.019
60-70 years	1.03
70-80 years	1.041
80-90 years	1.052
90-100 years	1.063
>100 years	1.074

High BUN and low Creatinine can be caused by a lot of reasons. If you take BUN and Creatinine blood tests and the results are higher than 20 mg/dL for BUN and lower than 0.9 mg/dL for Creatinine, your physician may recommend more tests to figure out the problem. You might also get these tests if your physician thinks you have some other disease.

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How the BUN and Creatinine Tests Are Done :

If your doctor wants BUN and Creatinine tests on you, you may need to go through these tests. During the BUN and Creatinine blood tests, a pathologist will put a needle into your veins and take out a small quantity of blood. A pathologist is a physician in the medical field who thoroughly studies the causes and effects of disease. Within a few hours you will get your BUN and Creatinine Test reports by your pathologist.