What causes high RDW and low RDW SD?

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

If your RDW is in between 11.6 % and 14 % and your RDW SD is in between 39 fL and 46 fL then you need not worry as these are the normal ranges for RDW 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 RDW : 11.6 - 14 %

Ideal values of RDW depending on age :

Age	Ideal RDW value
<5 years	11.913
5-10 years	12.235
10-15 years	12.565
15-20 years	12.904
20-25 years	13.252
25-30 years	13.61
30-35 years	13.977
35-40 years	13.966
40-45 years	13.956
45-50 years	13.946
50-55 years	13.936
55-60 years	13.926
60-70 years	13.916
70-80 years	13.906
80-90 years	13.895
90-100 years	13.885
>100 years	13.875

*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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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 RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	40.053
5-10 years	41.134
10-15 years	42.245
15-20 years	43.386
20-25 years	44.557
25-30 years	45.76
30-35 years	45.727
35-40 years	45.694
40-45 years	45.661
45-50 years	45.628
50-55 years	45.595
55-60 years	45.562
60-70 years	45.529
70-80 years	45.496
80-90 years	45.462
90-100 years	45.428
>100 years	45.395

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

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