What causes high RDW and low CRP?

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

If your RDW is in between 11.6 % and 14 % and your CRP is in between 0.1 mg/L and 3 mg/L then you need not worry as these are the normal ranges for RDW and CRP 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 levels include:

• Crohn's disease
• Chronic liver disease
• Thalassemia, an inherited blood disorder
• An iron or vitamin deficiency
• Heart disease

RDW treatment - Click to read 10 GOLDEN ARTICLES on Anemia

Normal range of RDW : 11.6 - 14 %

Ideal values of RDW depending on age :

Age	Ideal RDW value
<5 years	11.893
5-10 years	12.194
10-15 years	12.503
15-20 years	12.819
20-25 years	13.143
25-30 years	13.476
30-35 years	13.817
35-40 years	13.809
40-45 years	13.8
45-50 years	13.791
50-55 years	13.782
55-60 years	13.773
60-70 years	13.764
70-80 years	13.755
80-90 years	13.746
90-100 years	13.737
>100 years	13.729

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

Normal range of CRP : 0.1 - 3 mg/L

Ideal values of CRP depending on age :

Age	Ideal CRP value
<5 years	0.11278
5-10 years	0.11563
10-15 years	0.11856
15-20 years	0.12156
20-25 years	0.12464
25-30 years	0.12779
30-35 years	0.13102
35-40 years	0.13433
40-45 years	0.13773
45-50 years	0.14121
50-55 years	0.14478
55-60 years	0.14844
60-70 years	0.1522
70-80 years	0.15605
80-90 years	0.16
90-100 years	0.16405
>100 years	0.1682

High RDW and low CRP can be caused by a lot of reasons. If you take RDW and CRP blood tests and the results are higher than 14 % for RDW and lower than 0.1 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 and CRP Tests Are Done :

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