What causes high BUN and low INR?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your INR is in between 0.9 ratio and 1.2 ratio then you need not worry as these are the normal ranges for BUN and INR 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	6.064
5-10 years	6.129
10-15 years	6.195
15-20 years	6.262
20-25 years	6.329
25-30 years	6.397
30-35 years	6.466
35-40 years	6.535
40-45 years	6.605
45-50 years	6.676
50-55 years	6.748
55-60 years	6.82
60-70 years	6.893
70-80 years	6.967
80-90 years	7.042
90-100 years	7.118
>100 years	7.194

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

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Normal range of INR : 0.9 - 1.2 ratio

Ideal values of INR depending on age :

Age	Ideal INR value
<5 years	0.91
5-10 years	0.92
10-15 years	0.93
15-20 years	0.94
20-25 years	0.95
25-30 years	0.96
30-35 years	0.97
35-40 years	0.98
40-45 years	0.991
45-50 years	1.002
50-55 years	1.013
55-60 years	1.024
60-70 years	1.035
70-80 years	1.046
80-90 years	1.057
90-100 years	1.068
>100 years	1.079

High BUN and low INR can be caused by a lot of reasons. If you take BUN and INR blood tests and the results are higher than 20 mg/dL for BUN and lower than 0.9 ratio for INR, 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 INR Tests Are Done :

If your doctor wants BUN and INR tests on you, you may need to go through these tests. During the BUN and INR 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 INR 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