What causes high WBC and low RDW SD?

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

If your WBC is in between 4 thou/uL and 11 thou/uL and your RDW SD is in between 39 fL and 46 fL then you need not worry as these are the normal ranges for WBC 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 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	4.815
55-60 years	4.897
60-70 years	4.98
70-80 years	5.065
80-90 years	5.151
90-100 years	5.239
>100 years	5.328

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

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

• Infections, most commonly caused by bacteria and some viruses, less commonly by fungi or parasites
• Bone marrow damage
• Overwhelming infections (e.g., sepsis)
• Inflammation or inflammatory conditions such as vasculitis or inflammatory bowel disease
• Myelodysplastic syndrome

If you want your blood test report to be interpreted by WBC specialist, you can upload your report. Our WBC 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	39.663
5-10 years	40.337
10-15 years	41.023
15-20 years	41.72
20-25 years	42.429
25-30 years	43.15
30-35 years	43.884
35-40 years	44.63
40-45 years	45.389
45-50 years	45.376
50-55 years	45.363
55-60 years	45.35
60-70 years	45.337
70-80 years	45.324
80-90 years	45.311
90-100 years	45.298
>100 years	45.285

High WBC and low RDW SD can be caused by a lot of reasons. If you take WBC and RDW SD blood tests and the results are higher than 11 thou/uL for WBC 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 WBC and RDW SD Tests Are Done :

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