What causes high RDW and low FT3 thyroid?

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

If your RDW is in between 11.6 % and 14 % 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 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.

Some examples of conditions that can increase or decrease RDW levels include:

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

RDW treatment - Click to read 10 GOLDEN ARTICLES on Anemia

Normal range of RDW : 11.6 - 14 %

Ideal values of RDW depending on age :

Age	Ideal RDW value
<5 years	11.889
5-10 years	12.185
10-15 years	12.488
15-20 years	12.799
20-25 years	13.118
25-30 years	13.445
30-35 years	13.78
35-40 years	13.771
40-45 years	13.763
45-50 years	13.755
50-55 years	13.746
55-60 years	13.737
60-70 years	13.728
70-80 years	13.72
80-90 years	13.712
90-100 years	13.703
>100 years	13.694

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

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	2.357
5-10 years	2.416
10-15 years	2.476
15-20 years	2.538
20-25 years	2.601
25-30 years	2.666
30-35 years	2.732
35-40 years	2.8
40-45 years	2.87
45-50 years	2.941
50-55 years	3.014
55-60 years	3.089
60-70 years	3.166
70-80 years	3.245
80-90 years	3.326
90-100 years	3.409
>100 years	3.494

High RDW and low FT3 thyroid can be caused by a lot of reasons. If you take RDW and FT3 thyroid blood tests and the results are higher than 14 % for RDW 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 and FT3 thyroid Tests Are Done :

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