What causes high RDW SD and low CRP?

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

If your RDW SD is in between 39 fL and 46 fL and your CRP is in between 0 mg/L and 3 mg/L then you need not worry as these are the normal ranges for RDW SD and CRP 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 SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.684
5-10 years	40.38
10-15 years	41.088
15-20 years	41.808
20-25 years	42.541
25-30 years	43.287
30-35 years	44.046
35-40 years	44.818
40-45 years	45.604
45-50 years	45.59
50-55 years	45.576
55-60 years	45.562
60-70 years	45.548
70-80 years	45.534
80-90 years	45.52
90-100 years	45.506
>100 years	45.492

*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

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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 CRP : 0 - 3 mg/L

Ideal values of CRP depending on age :

Age	Ideal CRP value
<5 years	0.11193
5-10 years	0.11389
10-15 years	0.11589
15-20 years	0.11792
20-25 years	0.11999
25-30 years	0.12209
30-35 years	0.12423
35-40 years	0.12641
40-45 years	0.12863
45-50 years	0.13088
50-55 years	0.13317
55-60 years	0.1355
60-70 years	0.13788
70-80 years	0.1403
80-90 years	0.14276
90-100 years	0.14526
>100 years	0.14781

High RDW SD and low CRP can be caused by a lot of reasons. If you take RDW SD and CRP blood tests and the results are higher than 46 fL for RDW SD and lower than 0 mg/L for CRP, 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 CRP Tests Are Done :

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