Is RDW SD 30 low, normal or dangerous? What does RDW SD level 30 mean?

📅 Medical Review Date: January 26, 2026

Your RDW SD level of 30 is a Low RDW SD level.

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	40.17
5-10 years	41.375
10-15 years	42.616
15-20 years	43.894
20-25 years	45.211
25-30 years	45.17
30-35 years	45.129
35-40 years	45.089
40-45 years	45.049
45-50 years	45.008
50-55 years	44.967
55-60 years	44.927
60-70 years	44.887
70-80 years	44.847
80-90 years	44.806
90-100 years	44.766
>100 years	44.726

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

Get Advice via Email : Send us your blood test report, and our RDW SD experts will review it. You'll receive a detailed analysis and personalized treatment guidance via email within 12 hours. If you have additional blood test results besides RDW SD, please include those too—an accurate diagnosis often requires a full view of all abnormalities. Upload blood test report now

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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

Receive world-class medical opinion about your low RDW SD levels over email.Upload blood test report now

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	40.205
5-10 years	41.447
10-15 years	42.728
15-20 years	44.048
20-25 years	45.409
25-30 years	45.366
30-35 years	45.323
35-40 years	45.279
40-45 years	45.236
45-50 years	45.193
50-55 years	45.149
55-60 years	45.106
60-70 years	45.063
70-80 years	45.02
80-90 years	44.977
90-100 years	44.934
>100 years	44.891

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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