What causes high RDW SD and low APTT?

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

If your RDW SD is in between 39 fL and 46 fL and your APTT is in between 22 seconds and 35 seconds then you need not worry as these are the normal ranges for RDW SD 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 SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.686
5-10 years	40.384
10-15 years	41.095
15-20 years	41.818
20-25 years	42.554
25-30 years	43.303
30-35 years	44.065
35-40 years	44.841
40-45 years	45.63
45-50 years	45.616
50-55 years	45.602
55-60 years	45.588
60-70 years	45.574
70-80 years	45.56
80-90 years	45.546
90-100 years	45.532
>100 years	45.518

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

If you want your blood test report to be interpreted by RDW SD specialist, then you can upload your report. Our RDW SD 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 SD levels include:

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

If you want your blood test report to be interpreted by RDW SD specialist, you can upload your report. Our RDW SD 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	22.387
5-10 years	22.781
10-15 years	23.182
15-20 years	23.59
20-25 years	24.005
25-30 years	24.427
30-35 years	24.857
35-40 years	25.294
40-45 years	25.739
45-50 years	26.192
50-55 years	26.653
55-60 years	27.122
60-70 years	27.599
70-80 years	28.085
80-90 years	28.579
90-100 years	29.082
>100 years	29.594

High RDW SD and low APTT can be caused by a lot of reasons. If you take RDW SD and APTT blood tests and the results are higher than 46 fL for RDW SD 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 SD and APTT Tests Are Done :

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