What causes high RDW SD and low FT3 thyroid?

high RDW SD

High RDW SD and low FT3 thyroid can be caused by many reasons.

If your RDW SD is in between 39 fL and 46 fL and your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL then you need not worry as these are the normal ranges for RDW SD and FT3 thyroid respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Important - Go to the end of this article and read how our patients treated their RDW SD levels 

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Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :
Age Ideal RDW SD value
<5 years 39.682
5-10 years 40.376
10-15 years 41.082
15-20 years 41.801
20-25 years 42.532
25-30 years 43.276
30-35 years 44.033
35-40 years 44.803
40-45 years 45.587
45-50 years 45.573
50-55 years 45.559
55-60 years 45.545
60-70 years 45.531
70-80 years 45.517
80-90 years 45.503
90-100 years 45.489
>100 years 45.475

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

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 FT3 thyroid : 2.3 - 4.2 pg/mL

Ideal values of FT3 thyroid depending on age :
Age Ideal FT3 thyroid value
<5 years 2.34
5-10 years 2.381
10-15 years 2.423
15-20 years 2.465
20-25 years 2.508
25-30 years 2.552
30-35 years 2.597
35-40 years 2.642
40-45 years 2.688
45-50 years 2.735
50-55 years 2.783
55-60 years 2.832
60-70 years 2.882
70-80 years 2.932
80-90 years 2.983
90-100 years 3.035
>100 years 3.088

High RDW SD and low FT3 thyroid can be caused by a lot of reasons. If you take RDW SD and FT3 thyroid blood tests and the results are higher than 46 fL for RDW SD and lower than 2.3 pg/mL for FT3 thyroid, 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 FT3 thyroid Tests Are Done :

If your doctor wants RDW SD and FT3 thyroid tests on you, you may need to go through these tests. During the RDW SD and FT3 thyroid 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 FT3 thyroid Test reports by your pathologist.

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Dr. Dwayne Michaels
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Dr. Dwayne Michaels
Guest Author
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