What does high RDW and RDW SD mean in blood test?

High RDW and RDW SD can be caused by numerous problems.

High levels of RDW and RDW SD in the blood indicate a variety of health problems. If your blood RDW level is between 11.6 % to 14 % and the RDW SD level is between 39 % to 46 fL, then your body does not have any underlying health problems. But if RDW and RDW SD levels exceed these levels, you should see a doctor immediately.

Normal RDW range : 11.6 - 14 %

Age-wise ideal RDW level in blood:

Age	Ideal RDW value
<5 years	12.261
5-10 years	12.96
10-15 years	13.699
15-20 years	13.655
20-25 years	13.61
25-30 years	13.566
30-35 years	13.522
35-40 years	13.478
40-45 years	13.434
45-50 years	13.391
50-55 years	13.347
55-60 years	13.304
60-70 years	13.26
70-80 years	13.217
80-90 years	13.97
90-100 years	13.924
>100 years	13.879

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

If you want your blood test report to be interpreted by RDW specialist, then you can upload your report. Our RDW expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

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Some examples of conditions that increase or decrease RDW levels include:

• Crohn's disease
• Chronic liver disease
• Thalassemia, an inherited blood disorder
• An iron or vitamin deficiency
• Heart disease

If you want your blood test report to be interpreted by RDW specialist, you can upload your report. Our RDW expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

Normal RDW SD range : 39 - 46 fL

Age-wise ideal RDW SD level in blood:

Age	Ideal RDW SD value
<5 years	41.223
5-10 years	43.573
10-15 years	43.432
15-20 years	45.908
20-25 years	45.759
25-30 years	45.61
30-35 years	45.462
35-40 years	45.314
40-45 years	45.167
45-50 years	45.021
50-55 years	44.875
55-60 years	44.729
60-70 years	44.584
70-80 years	44.439
80-90 years	44.295
90-100 years	44.151
>100 years	44.008

High RDW and RDW SD levels in the blood can cause a number of health problems. Your GP may recommend follow-up tests to get an important picture of your overall health and well-being. If the results are greater than 14 % for RDW and more than 46 fL for RDW SD, you may also need some follow-up tests that will help detect the underlying disease early.

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How is a blood test performed in the lab?

Depending on the symptoms you are experiencing, your doctor may order a RDW and RDW SD test. In most hospitals RDW and RDW SD results can be obtained within three to six hours after blood is taken. The blood is usually drawn from a vein on the inside of the elbow or the back of the hand. Drink plenty of water before your appointment. If you experience any symptoms that you are concerned about are out of the ordinary, call your doctor immediately.