What causes high RDW SD and low Prothrombin time?

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

If your RDW SD is in between 39 fL and 46 fL and your Prothrombin time is in between 12 seconds and 16 seconds then you need not worry as these are the normal ranges for RDW SD and Prothrombin time respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Some examples of conditions that can 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

RDW SD treatment - Click to read 10 GOLDEN ARTICLES on Anemia

Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.69
5-10 years	40.392
10-15 years	41.106
15-20 years	41.833
20-25 years	42.573
25-30 years	43.326
30-35 years	44.092
35-40 years	44.872
40-45 years	45.665
45-50 years	45.65
50-55 years	45.636
55-60 years	45.622
60-70 years	45.608
70-80 years	45.593
80-90 years	45.579
90-100 years	45.565
>100 years	45.551

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

Normal range of Prothrombin time : 12 - 16 seconds

Ideal values of Prothrombin time depending on age :

Age	Ideal Prothrombin time value
<5 years	12.212
5-10 years	12.428
10-15 years	12.648
15-20 years	12.872
20-25 years	13.1
25-30 years	13.332
30-35 years	13.568
35-40 years	13.808
40-45 years	14.052
45-50 years	14.3
50-55 years	14.553
55-60 years	14.81
60-70 years	15.072
70-80 years	15.338
80-90 years	15.609
90-100 years	15.885
>100 years	15.88

High RDW SD and low Prothrombin time can be caused by a lot of reasons. If you take RDW SD and Prothrombin time blood tests and the results are higher than 46 fL for RDW SD and lower than 12 seconds for Prothrombin time, 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 Prothrombin time Tests Are Done :

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

Medical References

• MedlinePlus – RDW (Red Cell Distribution Width)
• Cleveland Clinic – RDW Blood Test: What It Is, Procedure & Results
• NIH – RDW-SD is Superior to RDW-CV in Reflecting Liver Fibrosis Stage in Patients with Chronic Hepatitis B