What causes high RDW SD and low Cystatin c?

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

If your RDW SD is in between 39 fL and 46 fL and your Cystatin c is in between 0.62 mg/L and 1.03 mg/L then you need not worry as these are the normal ranges for RDW SD and Cystatin c 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 SD levels include:

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

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

Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.686
5-10 years	40.384
10-15 years	41.094
15-20 years	41.817
20-25 years	42.553
25-30 years	43.302
30-35 years	44.064
35-40 years	44.839
40-45 years	45.628
45-50 years	45.614
50-55 years	45.6
55-60 years	45.586
60-70 years	45.572
70-80 years	45.558
80-90 years	45.544
90-100 years	45.53
>100 years	45.516

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

Normal range of Cystatin c : 0.62 - 1.03 mg/L

Ideal values of Cystatin c depending on age :

Age	Ideal Cystatin c value
<5 years	0.631
5-10 years	0.642
10-15 years	0.653
15-20 years	0.664
20-25 years	0.676
25-30 years	0.688
30-35 years	0.7
35-40 years	0.712
40-45 years	0.725
45-50 years	0.738
50-55 years	0.751
55-60 years	0.764
60-70 years	0.777
70-80 years	0.791
80-90 years	0.805
90-100 years	0.819
>100 years	0.833

High RDW SD and low Cystatin c can be caused by a lot of reasons. If you take RDW SD and Cystatin c blood tests and the results are higher than 46 fL for RDW SD and lower than 0.62 mg/L for Cystatin c, 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 Cystatin c Tests Are Done :

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

Medical References

• MedlinePlus – RDW (Red Cell Distribution Width)
• Cleveland Clinic – RDW Blood Test: What It Is, Procedure & Results
• NIH – RDW-SD is Superior to RDW-CV in Reflecting Liver Fibrosis Stage in Patients with Chronic Hepatitis B