What causes high FT4 thyroid and low RDW?

High FT4 thyroid and low RDW can be caused by many reasons.

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your RDW is in between 11.6 % and 14 % then you need not worry as these are the normal ranges for FT4 thyroid and RDW 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 FT4 thyroid : 0.89 - 1.76 ng/dL

Ideal values of FT4 thyroid depending on age :

Age	Ideal FT4 thyroid value
<5 years	0.91741
5-10 years	0.94567
10-15 years	0.9748
15-20 years	1.00482
20-25 years	1.03577
25-30 years	1.06767
30-35 years	1.10055
35-40 years	1.13445
40-45 years	1.16939
45-50 years	1.20541
50-55 years	1.24254
55-60 years	1.28081
60-70 years	1.32026
70-80 years	1.36092
80-90 years	1.40284
90-100 years	1.44605
>100 years	1.49059

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

If you want your blood test report to be interpreted by FT4 thyroid specialist, then you can upload your report. Our FT4 thyroid 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 FT4 thyroid levels include:

• Autoimmune disease
• A non-functioning thyroid gland
• Thyroiditis
• Diabetes
• Liver disease

If you want your blood test report to be interpreted by FT4 thyroid specialist, you can upload your report. Our FT4 thyroid 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 RDW : 11.6 - 14 %

Ideal values of RDW depending on age :

Age	Ideal RDW value
<5 years	11.957
5-10 years	12.325
10-15 years	12.705
15-20 years	13.096
20-25 years	13.499
25-30 years	13.915
30-35 years	13.902
35-40 years	13.889
40-45 years	13.876
45-50 years	13.862
50-55 years	13.849
55-60 years	13.836
60-70 years	13.823
70-80 years	13.81
80-90 years	13.797
90-100 years	13.784
>100 years	13.771

High FT4 thyroid and low RDW can be caused by a lot of reasons. If you take FT4 thyroid and RDW blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 11.6 % for RDW, 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 FT4 thyroid and RDW Tests Are Done :

If your doctor wants FT4 thyroid and RDW tests on you, you may need to go through these tests. During the FT4 thyroid and RDW 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 FT4 thyroid and RDW Test reports by your pathologist.