What causes high RDW and low APTT?

High RDW and low APTT can be caused by many reasons.

If your RDW is in between 11.6 % and 14 % and your APTT is in between 22 seconds and 35 seconds then you need not worry as these are the normal ranges for RDW and APTT 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 RDW : 11.6 - 14 %

Ideal values of RDW depending on age :

Age	Ideal RDW value
<5 years	11.902
5-10 years	12.211
10-15 years	12.528
15-20 years	12.854
20-25 years	13.188
25-30 years	13.531
30-35 years	13.883
35-40 years	13.874
40-45 years	13.865
45-50 years	13.855
50-55 years	13.845
55-60 years	13.836
60-70 years	13.827
70-80 years	13.818
80-90 years	13.808
90-100 years	13.799
>100 years	13.79

*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 range of APTT : 22 - 35 seconds

Ideal values of APTT depending on age :

Age	Ideal APTT value
<5 years	22.572
5-10 years	23.159
10-15 years	23.761
15-20 years	24.379
20-25 years	25.013
25-30 years	25.663
30-35 years	26.33
35-40 years	27.015
40-45 years	27.717
45-50 years	28.438
50-55 years	29.177
55-60 years	29.936
60-70 years	30.714
70-80 years	31.513
80-90 years	32.332
90-100 years	33.173
>100 years	34.035

High RDW and low APTT can be caused by a lot of reasons. If you take RDW and APTT blood tests and the results are higher than 14 % for RDW and lower than 22 seconds for APTT, 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 RDW and APTT Tests Are Done :

If your doctor wants RDW and APTT tests on you, you may need to go through these tests. During the RDW and APTT 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 RDW and APTT Test reports by your pathologist.

Medical References

• Cleveland Clinic – RDW Blood Test: What It Is, Procedure & Results
• MedlinePlus – RDW (Red Cell Distribution Width)
• NIH – High red blood cell distribution width is closely associated with risk of carotid artery atherosclerosis