What causes high TIBC and low FT3 thyroid?

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

If your TIBC is in between 250 mcg/dL and 450 mcg/dL and your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL then you need not worry as these are the normal ranges for TIBC and FT3 thyroid 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 TIBC : 250 - 450 mcg/dL

Ideal values of TIBC depending on age :

Age	Ideal TIBC value
<5 years	254.373
5-10 years	258.822
10-15 years	263.349
15-20 years	267.955
20-25 years	272.642
25-30 years	277.411
30-35 years	282.263
35-40 years	287.2
40-45 years	292.223
45-50 years	297.334
50-55 years	302.534
55-60 years	307.825
60-70 years	313.209
70-80 years	318.687
80-90 years	324.261
90-100 years	329.932
>100 years	335.703

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

If you want your blood test report to be interpreted by TIBC specialist, then you can upload your report. Our TIBC 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 TIBC levels include:

• Iron deficiency
• Iron poisoning
• Inflammation
• Chronic liver disease
• Hemochromatosis

If you want your blood test report to be interpreted by TIBC specialist, you can upload your report. Our TIBC 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 FT3 thyroid : 2.3 - 4.2 pg/mL

Ideal values of FT3 thyroid depending on age :

Age	Ideal FT3 thyroid value
<5 years	2.34
5-10 years	2.381
10-15 years	2.423
15-20 years	2.465
20-25 years	2.508
25-30 years	2.552
30-35 years	2.597
35-40 years	2.642
40-45 years	2.688
45-50 years	2.735
50-55 years	2.783
55-60 years	2.832
60-70 years	2.882
70-80 years	2.932
80-90 years	2.983
90-100 years	3.035
>100 years	3.088

High TIBC and low FT3 thyroid can be caused by a lot of reasons. If you take TIBC and FT3 thyroid blood tests and the results are higher than 450 mcg/dL for TIBC and lower than 2.3 pg/mL for FT3 thyroid, 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 TIBC and FT3 thyroid Tests Are Done :

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

Medical References

• Cleveland Clinic – TIBC (Total Iron-Binding Capacity) Test
• WebMD – What to Know About Total Iron-Binding Capacity (TIBC) Test
• MedlinePlus – Total iron binding capacity