What causes high FT3 thyroid and low Ferritin?

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

If your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL and your Ferritin is in between 22 ng/mL and 322 ng/mL then you need not worry as these are the normal ranges for FT3 thyroid and Ferritin respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

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

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

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	2.376
5-10 years	2.455
10-15 years	2.536
15-20 years	2.62
20-25 years	2.707
25-30 years	2.797
30-35 years	2.89
35-40 years	2.986
40-45 years	3.085
45-50 years	3.187
50-55 years	3.292
55-60 years	3.401
60-70 years	3.514
70-80 years	3.63
80-90 years	3.75
90-100 years	3.874
>100 years	4.002

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

Normal range of Ferritin : 22 - 322 ng/mL

Ideal values of Ferritin depending on age :

Age	Ideal Ferritin value
<5 years	22.728
5-10 years	23.48
10-15 years	24.257
15-20 years	25.06
20-25 years	25.889
25-30 years	26.746
30-35 years	27.631
35-40 years	28.546
40-45 years	29.491
45-50 years	30.467
50-55 years	31.475
55-60 years	32.517
60-70 years	33.593
70-80 years	34.705
80-90 years	35.854
90-100 years	37.041
>100 years	38.267

High FT3 thyroid and low Ferritin can be caused by a lot of reasons. If you take FT3 thyroid and Ferritin blood tests and the results are higher than 4.2 pg/mL for FT3 thyroid and lower than 22 ng/mL for Ferritin, 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 Ferritin Tests Are Done :

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