What causes high RDW and low BUN?

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

If your RDW is in between 11.6 % and 14 % 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 RDW 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 RDW : 11.6 - 14 %

Ideal values of RDW depending on age :

Age	Ideal RDW value
<5 years	11.88
5-10 years	12.166
10-15 years	12.459
15-20 years	12.759
20-25 years	13.066
25-30 years	13.381
30-35 years	13.703
35-40 years	13.695
40-45 years	13.687
45-50 years	13.679
50-55 years	13.671
55-60 years	14
60-70 years	13.991
70-80 years	13.983
80-90 years	13.975
90-100 years	13.967
>100 years	13.959

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

If you want your blood test report to be interpreted by RDW specialist, then you can upload your report. Our RDW 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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RDW treatment - Click to read 10 GOLDEN ARTICLES on Anemia

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

• Crohn's disease
• Chronic liver disease
• Thalassemia, an inherited blood disorder
• An iron or vitamin deficiency
• Heart disease

If you want your blood test report to be interpreted by RDW specialist, you can upload your report. Our RDW 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	6.145
5-10 years	6.293
10-15 years	6.445
15-20 years	6.6
20-25 years	6.759
25-30 years	6.922
30-35 years	7.089
35-40 years	7.26
40-45 years	7.435
45-50 years	7.614
50-55 years	7.797
55-60 years	7.985
60-70 years	8.177
70-80 years	8.374
80-90 years	8.576
90-100 years	8.783
>100 years	8.995

High RDW and low BUN can be caused by a lot of reasons. If you take RDW and BUN blood tests and the results are higher than 14 % for RDW 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 RDW and BUN Tests Are Done :

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

Medical References

• Cleveland Clinic – RDW Blood Test: What It Is, Procedure & Results
• MedlinePlus – RDW (Red Cell Distribution Width)
• NIH – High red blood cell distribution width is closely associated with risk of carotid artery atherosclerosis