What causes high FT3 thyroid and low TSH 3?

High FT3 thyroid and low TSH 3 can be caused by many reasons.

If your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL 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 FT3 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 FT3 thyroid : 2.3 - 4.2 pg/mL

Ideal values of FT3 thyroid depending on age :

Age	Ideal FT3 thyroid value
<5 years	2.381
5-10 years	2.465
10-15 years	2.552
15-20 years	2.642
20-25 years	2.735
25-30 years	2.831
30-35 years	2.93
35-40 years	3.033
40-45 years	3.139
45-50 years	3.249
50-55 years	3.363
55-60 years	3.481
60-70 years	3.603
70-80 years	3.729
80-90 years	3.86
90-100 years	3.995
>100 years	4.135

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

If you want your blood test report to be interpreted by FT3 thyroid specialist, then you can upload your report. Our FT3 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

1,37,160

Total number of patients treated

Some examples of conditions that increase or decrease FT3 thyroid levels include:

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

If you want your blood test report to be interpreted by FT3 thyroid specialist, you can upload your report. Our FT3 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 FT3 thyroid and low TSH 3 can be caused by a lot of reasons. If you take FT3 thyroid and TSH 3 blood tests and the results are higher than 4.2 pg/mL for FT3 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 FT3 thyroid and TSH 3 Tests Are Done :

If your doctor wants FT3 thyroid and TSH 3 tests on you, you may need to go through these tests. During the FT3 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 FT3 thyroid and TSH 3 Test reports by your pathologist.

Medical References

• MedlinePlus – Triiodothyronine (T3) Tests
• Cleveland Clinic – Triiodothyronine (T3) Test: What It Is, Function & Levels
• MedlinePlus – T3 test
• WebMD – T3 Tests: T3 Uptake Levels, Common Thyroid Conditions, and More
• NIH – How to interpret thyroid function tests