What causes high RDW SD and low RDW CV?

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

If your RDW SD is in between 39 fL and 46 fL and your RDW CV is in between 11.6 % and 14 % then you need not worry as these are the normal ranges for RDW SD and RDW CV respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Some examples of conditions that can 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

RDW SD treatment - Click to read 10 GOLDEN ARTICLES on Anemia

Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.69
5-10 years	40.392
10-15 years	41.107
15-20 years	41.834
20-25 years	42.574
25-30 years	43.327
30-35 years	44.093
35-40 years	44.873
40-45 years	45.667
45-50 years	45.653
50-55 years	45.639
55-60 years	45.624
60-70 years	45.61
70-80 years	45.596
80-90 years	45.582
90-100 years	45.567
>100 years	45.553

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

Normal range of RDW CV : 11.6 - 14 %

Ideal values of RDW CV depending on age :

Age	Ideal RDW CV value
<5 years	11.805
5-10 years	12.014
10-15 years	12.227
15-20 years	12.443
20-25 years	12.663
25-30 years	12.887
30-35 years	13.115
35-40 years	13.347
40-45 years	13.583
45-50 years	13.823
50-55 years	13.819
55-60 years	13.814
60-70 years	13.809
70-80 years	13.804
80-90 years	13.799
90-100 years	13.795
>100 years	13.791

High RDW SD and low RDW CV can be caused by a lot of reasons. If you take RDW SD and RDW CV blood tests and the results are higher than 46 fL for RDW SD and lower than 11.6 % for RDW CV, 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 RDW CV Tests Are Done :

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

Medical References

• MedlinePlus – RDW (Red Cell Distribution Width)
• Cleveland Clinic – RDW Blood Test: What It Is, Procedure & Results
• NIH – RDW-SD is Superior to RDW-CV in Reflecting Liver Fibrosis Stage in Patients with Chronic Hepatitis B