Is RDW SD 34 low, normal or dangerous? What does RDW SD level 34 mean?

📅 Medical Review Date: December 28, 2025

Your RDW SD level of 34 is a Low RDW SD level.

An RDW SD level of 34 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	40.326
5-10 years	41.697
10-15 years	43.115
15-20 years	44.581
20-25 years	44.53
25-30 years	44.479
30-35 years	45.991
35-40 years	45.938
40-45 years	45.885
45-50 years	45.832
50-55 years	45.779
55-60 years	45.726
60-70 years	45.673
70-80 years	45.62
80-90 years	45.567
90-100 years	45.514
>100 years	45.461

*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	40.366
5-10 years	41.78
10-15 years	43.243
15-20 years	44.757
20-25 years	44.702
25-30 years	44.647
30-35 years	44.593
35-40 years	44.539
40-45 years	44.485
45-50 years	44.431
50-55 years	45.987
55-60 years	45.93
60-70 years	45.873
70-80 years	45.816
80-90 years	45.759
90-100 years	45.702
>100 years	45.645

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

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