What causes high BUN and low WBC?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your WBC is in between 4 thou/uL and 11 thou/uL then you need not worry as these are the normal ranges for BUN and WBC 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	7.108

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

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Normal range of WBC : 4 - 11 thou/uL

Ideal values of WBC depending on age :

Age	Ideal WBC value
<5 years	4.04
5-10 years	4.08
10-15 years	4.121
15-20 years	4.162
20-25 years	4.204
25-30 years	4.246
30-35 years	4.289
35-40 years	4.332
40-45 years	4.375
45-50 years	4.419
50-55 years	4.463
55-60 years	4.508
60-70 years	4.553
70-80 years	4.599
80-90 years	4.645
90-100 years	4.692
>100 years	4.739

High BUN and low WBC can be caused by a lot of reasons. If you take BUN and WBC blood tests and the results are higher than 20 mg/dL for BUN and lower than 4 thou/uL for WBC, 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 WBC Tests Are Done :

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