What causes high RDW and low MCH?

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

If your RDW is in between 11.6 % and 14 % and your MCH is in between 27 pg and 32 pg then you need not worry as these are the normal ranges for RDW and MCH 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	11.839
5-10 years	12.083
10-15 years	12.332
15-20 years	12.586
20-25 years	12.845
25-30 years	13.11
30-35 years	13.38
35-40 years	13.656
40-45 years	13.937
45-50 years	13.931
50-55 years	13.925
55-60 years	13.919
60-70 years	13.913
70-80 years	13.907
80-90 years	13.901
90-100 years	13.895
>100 years	13.889

*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 MCH : 27 - 32 pg

Ideal values of MCH depending on age :

Age	Ideal MCH value
<5 years	27.556
5-10 years	28.124
10-15 years	28.703
15-20 years	29.294
20-25 years	29.897
25-30 years	30.513
30-35 years	31.142
35-40 years	31.784
40-45 years	31.771
45-50 years	31.757
50-55 years	31.743
55-60 years	31.73
60-70 years	31.717
70-80 years	31.703
80-90 years	31.689
90-100 years	31.676
>100 years	31.663

High RDW and low MCH can be caused by a lot of reasons. If you take RDW and MCH blood tests and the results are higher than 14 % for RDW and lower than 27 pg for MCH, 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 MCH Tests Are Done :

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