What causes high FT4 thyroid and low Transferrin saturation?

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

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your Transferrin saturation is in between 13 % and 45 % then you need not worry as these are the normal ranges for FT4 thyroid and Transferrin saturation 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 FT4 thyroid levels include:

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

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	0.9232
5-10 years	0.95764
10-15 years	0.99336
15-20 years	1.03041
20-25 years	1.06884
25-30 years	1.10871
30-35 years	1.15006
35-40 years	1.19296
40-45 years	1.23746
45-50 years	1.28362
50-55 years	1.3315
55-60 years	1.38116
60-70 years	1.43268
70-80 years	1.48612
80-90 years	1.54155
90-100 years	1.59905
>100 years	1.65869

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

Normal range of Transferrin saturation : 13 - 45 %

Ideal values of Transferrin saturation depending on age :

Age	Ideal Transferrin saturation value
<5 years	13.485
5-10 years	13.988
10-15 years	14.51
15-20 years	15.051
20-25 years	15.612
25-30 years	16.194
30-35 years	16.798
35-40 years	17.425
40-45 years	18.075
45-50 years	18.749
50-55 years	19.448
55-60 years	20.173
60-70 years	20.925
70-80 years	21.706
80-90 years	22.516
90-100 years	23.356
>100 years	24.227

High FT4 thyroid and low Transferrin saturation can be caused by a lot of reasons. If you take FT4 thyroid and Transferrin saturation blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 13 % for Transferrin saturation, 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 Transferrin saturation Tests Are Done :

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

Medical References

• MedlinePlus – Thyroxine (T4) Test
• Cleveland Clinic – T4 (Thyroxine) Test: What It Is, Function, Purpose & Levels
• MedlinePlus – Free T4 test
• WebMD – What Is a Thyroxine (T4) Blood Test?
• Mayo Clinic – Hypothyroidism (underactive thyroid) - Diagnosis and treatment