What causes high BUN and low RDW?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your RDW is in between 11.6 % and 14 % then you need not worry as these are the normal ranges for BUN and RDW 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	6.183
15-20 years	6.245
20-25 years	6.308
25-30 years	6.372
30-35 years	6.436
35-40 years	6.501
40-45 years	6.567
45-50 years	6.633
50-55 years	6.7
55-60 years	6.768
60-70 years	6.836
70-80 years	6.905
80-90 years	6.975
90-100 years	7.045
>100 years	7.116

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

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Normal range of RDW : 11.6 - 14 %

Ideal values of RDW depending on age :

Age	Ideal RDW value
<5 years	11.717
5-10 years	11.835
10-15 years	11.954
15-20 years	12.074
20-25 years	12.196
25-30 years	12.319
30-35 years	12.443
35-40 years	12.568
40-45 years	12.695
45-50 years	12.823
50-55 years	12.952
55-60 years	13.083
60-70 years	13.215
70-80 years	13.348
80-90 years	13.483
90-100 years	13.619
>100 years	13.756

High BUN and low RDW can be caused by a lot of reasons. If you take BUN and RDW blood tests and the results are higher than 20 mg/dL for BUN and lower than 11.6 % for RDW, 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 RDW Tests Are Done :

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