Is RDW SD 56 high, normal or dangerous? What does RDW SD level 56 mean?

📅 Medical Review Date: January 12, 2026

Your RDW SD level of 56 is a High RDW SD level.

An RDW SD level of 56 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.

Important - Scroll to the end of this article to see how our patients managed their high RDW SD levels

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	41.184
5-10 years	43.49
10-15 years	45.925
15-20 years	45.781
20-25 years	45.638
25-30 years	45.495
30-35 years	45.353
35-40 years	45.211
40-45 years	45.069
45-50 years	44.928
50-55 years	44.787
55-60 years	44.646
60-70 years	44.506
70-80 years	44.366
80-90 years	44.226
90-100 years	44.088
>100 years	43.95

*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

1,51,150

Total number of patients treated

Important - Read more questions about high RDW SD levels after this video message

A video message on the treatment of your high RDW SD level

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Important - At the end of this article read how our patients treated their high RDW SD levels

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 high RDW SD levels over email.Upload blood test report now

Important - At the end of this article read how our patients treated their high RDW SD levels

Also Read :How our patients treated their high rdw sd?

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	41.25
5-10 years	43.629
10-15 years	43.484
15-20 years	45.992
20-25 years	45.839
25-30 years	45.687
30-35 years	45.535
35-40 years	45.383
40-45 years	45.232
45-50 years	45.082
50-55 years	44.932
55-60 years	44.783
60-70 years	44.634
70-80 years	44.485
80-90 years	44.337
90-100 years	44.189
>100 years	44.042

Also Read :Symptoms of High RDW SD

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.

Important :How our patients treated their high rdw sd?

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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.