What causes high RDW SD and low WBC?

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

If your RDW SD is in between 39 fL and 46 fL and your WBC is in between 4 thou/uL and 11 thou/uL then you need not worry as these are the normal ranges for RDW SD and WBC 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	39.664
5-10 years	40.339
10-15 years	41.026
15-20 years	41.724
20-25 years	42.434
25-30 years	43.156
30-35 years	43.891
35-40 years	44.638
40-45 years	45.398
45-50 years	45.385
50-55 years	45.371
55-60 years	45.358
60-70 years	45.345
70-80 years	45.332
80-90 years	45.319
90-100 years	45.306
>100 years	45.293

*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 WBC : 4 - 11 thou/uL

Ideal values of WBC depending on age :

Age	Ideal WBC value
<5 years	4.068
5-10 years	4.137
10-15 years	4.207
15-20 years	4.279
20-25 years	4.352
25-30 years	4.426
30-35 years	4.501
35-40 years	4.578
40-45 years	4.656
45-50 years	4.735
50-55 years	4.816
55-60 years	4.898
60-70 years	4.981
70-80 years	5.066
80-90 years	5.152
90-100 years	5.24
>100 years	5.329

High RDW SD and low WBC can be caused by a lot of reasons. If you take RDW SD and WBC blood tests and the results are higher than 46 fL for RDW SD and lower than 4 thou/uL for WBC, 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 WBC Tests Are Done :

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