What causes high FT4 thyroid and low RDW SD?

High FT4 thyroid and low RDW SD 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 SD is in between 39 fL and 46 fL then you need not worry as these are the normal ranges for FT4 thyroid and RDW SD 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	0.92293
5-10 years	0.95708
10-15 years	0.99249
15-20 years	1.02921
20-25 years	1.06729
25-30 years	1.10678
30-35 years	1.14773
35-40 years	1.1902
40-45 years	1.23424
45-50 years	1.27991
50-55 years	1.32727
55-60 years	1.37638
60-70 years	1.42731
70-80 years	1.48012
80-90 years	1.53488
90-100 years	1.59167
>100 years	1.65056

*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 SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	40.443
5-10 years	41.939
10-15 years	43.491
15-20 years	45.1
20-25 years	45.039
25-30 years	44.977
30-35 years	44.915
35-40 years	44.854
40-45 years	44.793
45-50 years	44.731
50-55 years	44.67
55-60 years	44.609
60-70 years	44.548
70-80 years	44.487
80-90 years	44.426
90-100 years	44.365
>100 years	44.305

High FT4 thyroid and low RDW SD can be caused by a lot of reasons. If you take FT4 thyroid and RDW SD blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 39 fL for RDW SD, 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 SD Tests Are Done :

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