What causes high RDW SD and low BUN?

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

If your RDW SD is in between 39 fL and 46 fL 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 SD 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 SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.679
5-10 years	40.37
10-15 years	41.073
15-20 years	41.788
20-25 years	42.516
25-30 years	43.256
30-35 years	44.009
35-40 years	44.775
40-45 years	45.555
45-50 years	45.541
50-55 years	45.527
55-60 years	45.514
60-70 years	45.5
70-80 years	45.486
80-90 years	45.472
90-100 years	45.459
>100 years	45.445

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

If you want your blood test report to be interpreted by RDW SD specialist, then you can upload your report. Our RDW SD 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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Some examples of conditions that increase or decrease RDW SD levels include:

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

If you want your blood test report to be interpreted by RDW SD specialist, you can upload your report. Our RDW SD 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	6.104
5-10 years	6.21
10-15 years	6.318
15-20 years	6.428
20-25 years	6.54
25-30 years	6.654
30-35 years	6.77
35-40 years	6.888
40-45 years	7.008
45-50 years	7.13
50-55 years	7.254
55-60 years	7.38
60-70 years	7.508
70-80 years	7.639
80-90 years	7.772
90-100 years	7.907
>100 years	8.045

High RDW SD and low BUN can be caused by a lot of reasons. If you take RDW SD and BUN blood tests and the results are higher than 46 fL for RDW SD 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 SD and BUN Tests Are Done :

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