What causes high CRP and low BUN?

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

If your CRP is in between 0 mg/L and 3 mg/L 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 CRP and BUN 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 CRP : 0 - 3 mg/L

Ideal values of CRP depending on age :

Age	Ideal CRP value
<5 years	0.11375
5-10 years	0.11763
10-15 years	0.12164
15-20 years	0.12579
20-25 years	0.13008
25-30 years	0.13452
30-35 years	0.13911
35-40 years	0.14385
40-45 years	0.14876
45-50 years	0.15383
50-55 years	0.15908
55-60 years	0.1645
60-70 years	0.17011
70-80 years	0.17591
80-90 years	0.18191
90-100 years	0.18811
>100 years	0.19452

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

If you want your blood test report to be interpreted by CRP specialist, then you can upload your report. Our CRP expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

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Some examples of conditions that increase or decrease CRP levels include:

• Inflammation
• Suspected bacterial infection
• Lupus
• Crohn disease
• Ulcerative colitis

If you want your blood test report to be interpreted by CRP specialist, you can upload your report. Our CRP expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

Normal range of BUN : 6 - 20 mg/dL

Ideal values of BUN depending on age :

Age	Ideal BUN value
<5 years	6.205
5-10 years	6.417
10-15 years	6.636
15-20 years	6.862
20-25 years	7.096
25-30 years	7.338
30-35 years	7.588
35-40 years	7.847
40-45 years	8.115
45-50 years	8.392
50-55 years	8.678
55-60 years	8.974
60-70 years	9.28
70-80 years	9.596
80-90 years	9.923
90-100 years	10.261
>100 years	10.611

High CRP and low BUN can be caused by a lot of reasons. If you take CRP and BUN blood tests and the results are higher than 3 mg/L for CRP 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 CRP and BUN Tests Are Done :

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