What causes high BUN and low RBC?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your RBC is in between 4.5 mil/uL and 5.5 mil/uL then you need not worry as these are the normal ranges for BUN and RBC 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	6.06
5-10 years	6.121
10-15 years	6.182
15-20 years	6.244
20-25 years	6.307
25-30 years	6.37
30-35 years	6.434
35-40 years	6.498
40-45 years	6.563
45-50 years	6.629
50-55 years	6.695
55-60 years	6.762
60-70 years	6.83
70-80 years	6.898
80-90 years	6.967
90-100 years	7.037
>100 years	7.107

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

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Normal range of RBC : 4.5 - 5.5 mil/uL

Ideal values of RBC depending on age :

Age	Ideal RBC value
<5 years	4.545
5-10 years	4.59
10-15 years	4.636
15-20 years	4.682
20-25 years	4.729
25-30 years	4.776
30-35 years	4.824
35-40 years	4.872
40-45 years	4.921
45-50 years	4.97
50-55 years	5.02
55-60 years	5.07
60-70 years	5.121
70-80 years	5.172
80-90 years	5.224
90-100 years	5.276
>100 years	5.329

High BUN and low RBC can be caused by a lot of reasons. If you take BUN and RBC blood tests and the results are higher than 20 mg/dL for BUN and lower than 4.5 mil/uL for RBC, 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 RBC Tests Are Done :

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