What causes high Hematocrit and low RDW SD?

High Hematocrit and low RDW SD can be caused by many reasons.

If your Hematocrit is in between 40 % and 50 % and your RDW SD is in between 39 fL and 46 fL then you need not worry as these are the normal ranges for Hematocrit and RDW SD respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Normal range of Hematocrit : 40 - 50 %

Ideal values of Hematocrit depending on age :

Age	Ideal Hematocrit value
<5 years	40.96
5-10 years	41.943
10-15 years	42.95
15-20 years	43.981
20-25 years	45.037
25-30 years	46.118
30-35 years	47.225
35-40 years	48.358
40-45 years	49.519
45-50 years	49.49
50-55 years	49.462
55-60 years	49.433
60-70 years	49.404
70-80 years	49.376
80-90 years	49.348
90-100 years	49.319
>100 years	49.291

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

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

1,37,160

Total number of patients treated

Hematocrit treatment - Click to read 10 GOLDEN ARTICLES on Anemia

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

• Damage to the bone marrow
• Kidney failure
• Excessive destruction of red blood cells
• Chronic inflammatory diseases
• Congenital heart disease

If you want your blood test report to be interpreted by Hematocrit specialist, you can upload your report. Our Hematocrit 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 range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.936
5-10 years	40.894
10-15 years	41.875
15-20 years	42.88
20-25 years	43.909
25-30 years	44.963
30-35 years	44.937
35-40 years	44.911
40-45 years	45.989
45-50 years	45.963
50-55 years	45.936
55-60 years	45.909
60-70 years	45.883
70-80 years	45.856
80-90 years	45.83
90-100 years	45.804
>100 years	45.777

High Hematocrit and low RDW SD can be caused by a lot of reasons. If you take Hematocrit and RDW SD blood tests and the results are higher than 50 % for Hematocrit and lower than 39 fL for RDW SD, your physician may recommend more tests to figure out the problem. You might also get these tests if your physician thinks you have some other disease.

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How the Hematocrit and RDW SD Tests Are Done :

If your doctor wants Hematocrit and RDW SD tests on you, you may need to go through these tests. During the Hematocrit and RDW SD blood tests, a pathologist will put a needle into your veins and take out a small quantity of blood. A pathologist is a physician in the medical field who thoroughly studies the causes and effects of disease. Within a few hours you will get your Hematocrit and RDW SD Test reports by your pathologist.

Medical References

• Cleveland Clinic – Hematocrit Test: What It Is, Levels, and High & Low Range
• Mayo Clinic – Hematocrit test
• MedlinePlus – Hematocrit Test