Is RDW SD 35 low, normal or dangerous? What does RDW SD level 35 mean?

📅 Medical Review Date: November 18, 2025

Your RDW SD level of 35 is a Low RDW SD level.

An RDW SD level of 35 fL usually means red blood cells are uniform in size. It suggests normal red blood cell production. Low levels of RDW SD typically do not cause specific symptoms and are often normal. This can be seen in healthy individuals with no blood disorders. Further tests are often needed to identify the cause and guide appropriate treatment.

Low RDW SD levels may indicate underlying health problems. The normal range is typically between 39 fL and 46 fL. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal RDW SD range for men is :39 - 46 fL

Ideal values of RDW SD depending on age (male) :

Age	Ideal RDW SD value
<5 years	40.365
5-10 years	41.778
10-15 years	43.24
15-20 years	44.753
20-25 years	44.698
25-30 years	44.643
30-35 years	44.589
35-40 years	44.535
40-45 years	44.481
45-50 years	44.427
50-55 years	45.982
55-60 years	45.925
60-70 years	45.868
70-80 years	45.811
80-90 years	45.755
90-100 years	45.699
>100 years	45.643

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

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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

Normal range of RDW SD found among women :39-46 fL

Ideal values of RDW SD depending on age (female) :

Age	Ideal RDW SD value
<5 years	40.406
5-10 years	41.863
10-15 years	43.372
15-20 years	44.936
20-25 years	44.878
25-30 years	44.82
30-35 years	44.762
35-40 years	44.704
40-45 years	44.646
45-50 years	44.588
50-55 years	44.53
55-60 years	44.472
60-70 years	44.414
70-80 years	44.356
80-90 years	45.955
90-100 years	45.896
>100 years	45.837

If you take a RDW SD blood test and the results are not in the normal range (39-46 fL), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

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How the RDW SD Test Is Done :

When your doctor orders a RDW SD test, it involves a straightforward blood draw to measure your RDW SD levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your RDW SD test results are usually available within a few hours.

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

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