What causes high FT3 thyroid and low Vitamin B12?

High FT3 thyroid and low Vitamin B12 can be caused by many reasons.

If your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL and your Vitamin B12 is in between 211 pg/mL and 911 pg/mL then you need not worry as these are the normal ranges for FT3 thyroid and Vitamin B12 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	2.381
5-10 years	2.465
10-15 years	2.552
15-20 years	2.642
20-25 years	2.736
25-30 years	2.833
30-35 years	2.933
35-40 years	3.037
40-45 years	3.145
45-50 years	3.256
50-55 years	3.371
55-60 years	3.49
60-70 years	3.614
70-80 years	3.742
80-90 years	3.874
90-100 years	4.011
>100 years	4.153

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

Normal range of Vitamin B12 : 211 - 911 pg/mL

Ideal values of Vitamin B12 depending on age :

Age	Ideal Vitamin B12 value
<5 years	218.469
5-10 years	226.203
10-15 years	234.211
15-20 years	242.502
20-25 years	251.087
25-30 years	259.975
30-35 years	269.178
35-40 years	278.707
40-45 years	288.573
45-50 years	298.788
50-55 years	309.365
55-60 years	320.317
60-70 years	331.656
70-80 years	343.397
80-90 years	355.553
90-100 years	368.14
>100 years	381.172

High FT3 thyroid and low Vitamin B12 can be caused by a lot of reasons. If you take FT3 thyroid and Vitamin B12 blood tests and the results are higher than 4.2 pg/mL for FT3 thyroid and lower than 211 pg/mL for Vitamin B12, 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 Vitamin B12 Tests Are Done :

If your doctor wants FT3 thyroid and Vitamin B12 tests on you, you may need to go through these tests. During the FT3 thyroid and Vitamin B12 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 Vitamin B12 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