What causes high FT4 thyroid and low TSH 3?

High FT4 thyroid and low TSH 3 can be caused by many reasons.

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your TSH 3 is in between 0.55 uIU/mL and 4.78 uIU/mL then you need not worry as these are the normal ranges for FT4 thyroid and TSH 3 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	0.92124
5-10 years	0.95358
10-15 years	0.98705
15-20 years	1.0217
20-25 years	1.05756
25-30 years	1.09468
30-35 years	1.1331
35-40 years	1.17287
40-45 years	1.21404
45-50 years	1.25665
50-55 years	1.30076
55-60 years	1.34642
60-70 years	1.39368
70-80 years	1.4426
80-90 years	1.49324
90-100 years	1.54565
>100 years	1.5999

*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 TSH 3 : 0.55 - 4.78 uIU/mL

Ideal values of TSH 3 depending on age :

Age	Ideal TSH 3 value
<5 years	0.569
5-10 years	0.589
10-15 years	0.61
15-20 years	0.631
20-25 years	0.653
25-30 years	0.676
30-35 years	0.7
35-40 years	0.725
40-45 years	0.75
45-50 years	0.776
50-55 years	0.803
55-60 years	0.831
60-70 years	0.86
70-80 years	0.89
80-90 years	0.921
90-100 years	0.953
>100 years	0.986

High FT4 thyroid and low TSH 3 can be caused by a lot of reasons. If you take FT4 thyroid and TSH 3 blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 0.55 uIU/mL for TSH 3, 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 TSH 3 Tests Are Done :

If your doctor wants FT4 thyroid and TSH 3 tests on you, you may need to go through these tests. During the FT4 thyroid and TSH 3 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 TSH 3 Test reports by your pathologist.