What causes high RDW SD and low MCH?

high RDW SD

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

If your RDW SD is in between 39 fL and 46 fL and your MCH is in between 27 pg and 32 pg then you need not worry as these are the normal ranges for RDW SD and MCH respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Important - Go to the end of this article and read how our patients treated their RDW SD levels 

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Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :
Age Ideal RDW SD value
<5 years 39.665
5-10 years 40.342
10-15 years 41.03
15-20 years 41.73
20-25 years 42.442
25-30 years 43.166
30-35 years 43.902
35-40 years 44.651
40-45 years 45.413
45-50 years 45.4
50-55 years 45.387
55-60 years 45.373
60-70 years 45.36
70-80 years 45.347
80-90 years 45.334
90-100 years 45.32
>100 years 45.307

*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

1,37,160

Total number of patients treated

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

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 MCH : 27 - 32 pg

Ideal values of MCH depending on age :
Age Ideal MCH value
<5 years 27.461
5-10 years 27.929
10-15 years 28.405
15-20 years 28.89
20-25 years 29.383
25-30 years 29.884
30-35 years 30.394
35-40 years 30.913
40-45 years 31.44
45-50 years 31.976
50-55 years 31.967
55-60 years 31.957
60-70 years 31.948
70-80 years 31.939
80-90 years 31.93
90-100 years 31.921
>100 years 31.912

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

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

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Dr. Dwayne Michaels
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Dr. Dwayne Michaels
Guest Author
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