What causes high TIBC and low FT4 thyroid?

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

If your TIBC is in between 250 mcg/dL and 450 mcg/dL and your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL then you need not worry as these are the normal ranges for TIBC and FT4 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	254.375
5-10 years	258.827
10-15 years	263.356
15-20 years	267.965
20-25 years	272.654
25-30 years	277.425
30-35 years	282.28
35-40 years	287.22
40-45 years	292.246
45-50 years	297.36
50-55 years	302.564
55-60 years	307.859
60-70 years	313.247
70-80 years	318.729
80-90 years	324.307
90-100 years	329.982
>100 years	335.757

*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 FT4 thyroid : 0.89 - 1.76 ng/dL

Ideal values of FT4 thyroid depending on age :

Age	Ideal FT4 thyroid value
<5 years	0.90558
5-10 years	0.92143
10-15 years	0.93756
15-20 years	0.95397
20-25 years	0.97066
25-30 years	0.98765
30-35 years	1.00493
35-40 years	1.02252
40-45 years	1.04041
45-50 years	1.05862
50-55 years	1.07715
55-60 years	1.096
60-70 years	1.11518
70-80 years	1.1347
80-90 years	1.15456
90-100 years	1.17476
>100 years	1.19532

High TIBC and low FT4 thyroid can be caused by a lot of reasons. If you take TIBC and FT4 thyroid blood tests and the results are higher than 450 mcg/dL for TIBC and lower than 0.89 ng/dL for FT4 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 FT4 thyroid Tests Are Done :

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