What causes high INR and low BUN?

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

If your INR is in between 0.9 ratio and 1.2 ratio and your BUN is in between 6 mg/dL and 20 mg/dL then you need not worry as these are the normal ranges for INR and BUN respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Some examples of conditions that can increase or decrease INR levels include:

• Liver disease
• Vitamin K abnormality
• Decreased or defective factor I (fibrinogen), II (prothrombin), V or X
• Hemophilia A and hemophilia B
• Autoantibody against a specific factor (e.g., factor VIII)

Normal range of INR : 0.9 - 1.2 ratio

Ideal values of INR depending on age :

Age	Ideal INR value
<5 years	0.949
5-10 years	1
10-15 years	1.054
15-20 years	1.111
20-25 years	1.171
25-30 years	1.167
30-35 years	1.163
35-40 years	1.16
40-45 years	1.157
45-50 years	1.154
50-55 years	1.15
55-60 years	1.146
60-70 years	1.143
70-80 years	1.14
80-90 years	1.137
90-100 years	1.199
>100 years	1.196

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

Normal range of BUN : 6 - 20 mg/dL

Ideal values of BUN depending on age :

Age	Ideal BUN value
<5 years	6.325
5-10 years	6.667
10-15 years	7.028
15-20 years	7.408
20-25 years	7.809
25-30 years	8.231
30-35 years	8.676
35-40 years	9.145
40-45 years	9.64
45-50 years	10.162
50-55 years	10.712
55-60 years	11.292
60-70 years	11.903
70-80 years	12.547
80-90 years	13.226
90-100 years	13.942
>100 years	14.696

High INR and low BUN can be caused by a lot of reasons. If you take INR and BUN blood tests and the results are higher than 1.2 ratio for INR and lower than 6 mg/dL for BUN, 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 INR and BUN Tests Are Done :

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

Medical References

• MedlinePlus – Prothrombin Time Test and INR (PT/INR)
• Mayo Clinic – Prothrombin time test
• Cleveland Clinic – Prothrombin Time (PT/INR) Test