What causes high CRP and low RDW SD?

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

If your CRP is in between 0.1 mg/L and 3 mg/L and your RDW SD is in between 39 fL and 46 fL then you need not worry as these are the normal ranges for CRP and RDW SD 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 CRP levels include:

• Inflammation
• Suspected bacterial infection
• Lupus
• Crohn disease
• Ulcerative colitis

Normal range of CRP : 0.1 - 3 mg/L

Ideal values of CRP depending on age :

Age	Ideal CRP value
<5 years	0.11407
5-10 years	0.11829
10-15 years	0.12267
15-20 years	0.12721
20-25 years	0.13192
25-30 years	0.1368
30-35 years	0.14186
35-40 years	0.14711
40-45 years	0.15255
45-50 years	0.15819
50-55 years	0.16404
55-60 years	0.17011
60-70 years	0.1764
70-80 years	0.18293
80-90 years	0.1897
90-100 years	0.19672
>100 years	0.204

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

Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	40.443
5-10 years	41.939
10-15 years	43.491
15-20 years	45.1
20-25 years	45.039
25-30 years	44.977
30-35 years	44.915
35-40 years	44.854
40-45 years	44.793
45-50 years	44.731
50-55 years	44.67
55-60 years	44.609
60-70 years	44.548
70-80 years	44.487
80-90 years	44.426
90-100 years	44.365
>100 years	44.305

High CRP and low RDW SD can be caused by a lot of reasons. If you take CRP and RDW SD blood tests and the results are higher than 3 mg/L for CRP and lower than 39 fL for RDW SD, 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 CRP and RDW SD Tests Are Done :

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

Medical References

• MedlinePlus – C-Reactive Protein (CRP) Test
• Mayo Clinic – C-reactive protein test
• Cleveland Clinic – C-Reactive Protein (CRP) Test: What It Is, Purpose & Results