What causes high RDW and low Vitamin B12?

High RDW and low Vitamin B12 can be caused by many reasons.

If your RDW is in between 11.6 % and 14 % and your Vitamin B12 is in between 211 pg/mL and 911 pg/mL then you need not worry as these are the normal ranges for RDW and Vitamin B12 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	11.895
5-10 years	12.197
10-15 years	12.507
15-20 years	12.825
20-25 years	13.151
25-30 years	13.485
30-35 years	13.828
35-40 years	13.819
40-45 years	13.81
45-50 years	13.801
50-55 years	13.793
55-60 years	13.784
60-70 years	13.775
70-80 years	13.766
80-90 years	13.757
90-100 years	13.748
>100 years	13.739

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

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 Vitamin B12 : 211 - 911 pg/mL

Ideal values of Vitamin B12 depending on age :

Age	Ideal Vitamin B12 value
<5 years	216.359
5-10 years	221.855
10-15 years	227.49
15-20 years	233.268
20-25 years	239.193
25-30 years	245.269
30-35 years	251.499
35-40 years	257.887
40-45 years	264.437
45-50 years	271.154
50-55 years	278.041
55-60 years	285.103
60-70 years	292.345
70-80 years	299.771
80-90 years	307.385
90-100 years	315.193
>100 years	323.199

High RDW and low Vitamin B12 can be caused by a lot of reasons. If you take RDW and Vitamin B12 blood tests and the results are higher than 14 % for RDW and lower than 211 pg/mL for Vitamin B12, 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 Vitamin B12 Tests Are Done :

If your doctor wants RDW and Vitamin B12 tests on you, you may need to go through these tests. During the RDW and Vitamin B12 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 Vitamin B12 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