What causes high FT3 thyroid and low TIBC?

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

If your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL and your TIBC is in between 250 mcg/dL and 450 mcg/dL then you need not worry as these are the normal ranges for FT3 thyroid and TIBC 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	2.385
5-10 years	2.473
10-15 years	2.565
15-20 years	2.66
20-25 years	2.759
25-30 years	2.861
30-35 years	2.967
35-40 years	3.077
40-45 years	3.191
45-50 years	3.309
50-55 years	3.432
55-60 years	3.559
60-70 years	3.691
70-80 years	3.828
80-90 years	3.97
90-100 years	4.117
>100 years	4.112

*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 TIBC : 250 - 450 mcg/dL

Ideal values of TIBC depending on age :

Age	Ideal TIBC value
<5 years	259.275
5-10 years	268.894
10-15 years	278.87
15-20 years	289.216
20-25 years	299.946
25-30 years	311.074
30-35 years	322.615
35-40 years	334.584
40-45 years	346.997
45-50 years	359.871
50-55 years	373.222
55-60 years	387.069
60-70 years	401.429
70-80 years	416.322
80-90 years	431.768
90-100 years	447.787
>100 years	447.171

High FT3 thyroid and low TIBC can be caused by a lot of reasons. If you take FT3 thyroid and TIBC blood tests and the results are higher than 4.2 pg/mL for FT3 thyroid and lower than 250 mcg/dL for TIBC, 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 TIBC Tests Are Done :

If your doctor wants FT3 thyroid and TIBC tests on you, you may need to go through these tests. During the FT3 thyroid and TIBC 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 TIBC 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