Is RDW SD 63 high, normal or dangerous? What does RDW SD level 63 mean?

📅 Medical Review Date: October 9, 2025

Your RDW SD level of 63 is a High RDW SD level.

An RDW SD level of 63 fL usually means there is significant variation in red blood cell sizes. It suggests an underlying blood disorder. High levels of RDW SD can cause fatigue, pale skin, weakness, shortness of breath, heart palpitations, headache, and cold extremities. This can be caused by thalassemia, iron deficiency, vitamin B12 deficiency, or chronic liver disease. Further tests are often needed to identify the cause and guide appropriate treatment.

High 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	41.457
5-10 years	44.069
10-15 years	43.894
15-20 years	43.719
20-25 years	43.545
25-30 years	43.372
30-35 years	43.199
35-40 years	45.921
40-45 years	45.739
45-50 years	45.558
50-55 years	45.377
55-60 years	45.197
60-70 years	45.017
70-80 years	44.838
80-90 years	44.66
90-100 years	44.483
>100 years	44.306

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

Misdiagnosis is more common than people think—and the consequences can be serious. Delayed treatment, unnecessary medication, or worse. If you want a second opinion on your blood work, one option is to upload it to a site like wholebodyprotocol.com, where world-class doctors review your results. They charge a small fee—around $90 (though you'll want to check the latest price as it fluctuates)—and email you a detailed report. With over 12 million people affected by misdiagnosis every year, that little bit of extra peace of mind can go a long way.

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	41.531
5-10 years	44.226
10-15 years	44.04
15-20 years	43.855
20-25 years	43.671
25-30 years	43.487
30-35 years	43.304
35-40 years	43.122
40-45 years	45.92
45-50 years	45.727
50-55 years	45.534
55-60 years	45.343
60-70 years	45.152
70-80 years	44.962
80-90 years	44.773
90-100 years	44.584
>100 years	44.396

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