What causes high BUN and low RDW SD?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your RDW SD is in between 39 fL and 46 fL then you need not worry as these are the normal ranges for BUN and RDW SD 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	6.064
5-10 years	6.129
10-15 years	6.195
15-20 years	6.261
20-25 years	6.328
25-30 years	6.396
30-35 years	6.464
35-40 years	6.533
40-45 years	6.603
45-50 years	6.674
50-55 years	6.745
55-60 years	6.817
60-70 years	6.89
70-80 years	6.964
80-90 years	7.039
90-100 years	7.114
>100 years	7.19

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

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Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.417
5-10 years	39.839
10-15 years	40.265
15-20 years	40.696
20-25 years	41.131
25-30 years	41.571
30-35 years	42.016
35-40 years	42.466
40-45 years	42.92
45-50 years	43.379
50-55 years	43.843
55-60 years	44.312
60-70 years	44.786
70-80 years	45.265
80-90 years	45.749
90-100 years	45.744
>100 years	45.738

High BUN and low RDW SD can be caused by a lot of reasons. If you take BUN and RDW SD blood tests and the results are higher than 20 mg/dL for BUN and lower than 39 fL for RDW SD, 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 SD Tests Are Done :

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