Is RDW SD 43.6 normal, high or low? What does RDW SD level 43.6 mean?

📅 Medical Review Date: November 14, 2025

Your RDW SD level of 43.6 is a Normal RDW SD level.

Normal 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	40.7
5-10 years	42.475
10-15 years	44.327
15-20 years	44.243
20-25 years	44.159
25-30 years	44.075
30-35 years	45.997
35-40 years	45.909
40-45 years	45.822
45-50 years	45.735
50-55 years	45.648
55-60 years	45.561
60-70 years	45.474
70-80 years	45.388
80-90 years	45.302
90-100 years	45.216
>100 years	45.13

*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 normal 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	40.751
5-10 years	42.581
10-15 years	44.493
15-20 years	44.403
20-25 years	44.313
25-30 years	44.224
30-35 years	44.135
35-40 years	44.046
40-45 years	43.957
45-50 years	45.931
50-55 years	45.839
55-60 years	45.747
60-70 years	45.654
70-80 years	45.562
80-90 years	45.47
90-100 years	45.378
>100 years	45.287

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