What causes high BUN and low BUN Creatinine ratio?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your BUN Creatinine ratio is in between 5 Ratio and 15 Ratio then you need not worry as these are the normal ranges for BUN and BUN Creatinine ratio 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	6.255
20-25 years	6.32
25-30 years	6.386
30-35 years	6.453
35-40 years	6.52
40-45 years	6.588
45-50 years	6.657
50-55 years	6.726
55-60 years	6.796
60-70 years	6.867
70-80 years	6.939
80-90 years	7.011
90-100 years	7.084
>100 years	7.158

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

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Normal range of BUN Creatinine ratio : 5 - 15 Ratio

Ideal values of BUN Creatinine ratio depending on age :

Age	Ideal BUN Creatinine ratio value
<5 years	5.052
5-10 years	5.105
10-15 years	5.158
15-20 years	5.212
20-25 years	5.266
25-30 years	5.321
30-35 years	5.376
35-40 years	5.432
40-45 years	5.489
45-50 years	5.546
50-55 years	5.604
55-60 years	5.662
60-70 years	5.721
70-80 years	5.781
80-90 years	5.841
90-100 years	5.902
>100 years	5.964

High BUN and low BUN Creatinine ratio can be caused by a lot of reasons. If you take BUN and BUN Creatinine ratio blood tests and the results are higher than 20 mg/dL for BUN and lower than 5 Ratio for BUN Creatinine ratio, 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 BUN Creatinine ratio Tests Are Done :

If your doctor wants BUN and BUN Creatinine ratio tests on you, you may need to go through these tests. During the BUN and BUN Creatinine ratio 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 BUN Creatinine ratio Test reports by your pathologist.

Medical References

• Mayo Clinic – Blood urea nitrogen (BUN) test
• MedlinePlus – BUN (Blood Urea Nitrogen)
• Cleveland Clinic – Blood Urea Nitrogen (BUN): Testing, Levels & Indication