What Are Normal Thyroid Levels

You should know the normal thyroid levels from the thyroid test results and their significance.

Your Doctor may recommend you to undergo thyroid function blood test if you have some .

Thyroid disease | Natural Thyroid treatment

Blood Tests for Thyroid : Thyroid Level Chart

The blood test for thyroid include the following:

Thyroid hormone blood tests include Total T4, T3 and free thyroxine (FT4), free thyroxine index (FTI) and free triiodothyronine (FT3).



Normal Thyroid Levels

The normal values as given in the following table may vary from lab to lab as T4, T3 and TSH are compared to the reference range. The reference range can vary slightly from one hospital or lab to another.

Most healthy people will have results within the range. If the results show borderline levels, it may indicate a borderline disease. For such patients, the TRH (Thyroid-Stimulating Hormone) test can be useful. The TRH test can tell whether a patient has an underactive, overactive, normal thyroid.

Hormone TestAdultsBabies and ChildrenNewborns
(1 to 14 days of old)
Normal Thyroid levels
Total thyroxine (T4)
mcg/dL
5 - 145.6 - 16.69.8 - 22.6
Total triiodothyronine (T3)
ng/dL
80 - 23083 - 28032 - 250
Free thyroxine Index (FTI)4.2 - 13.05.0 - 12.8 7.5 - 17.5
Free thyroxine (FT4)
ng/dL
0.8 - 2.4
Free triiodothyronine (FT3)
ng/dL
0.2 - 0.6
Thyroid-stimulating hormone (TSH)
mU/L
0.4 - 4.53 - 18

mcg/dL = micrograms per deciliter, ng/dL = nanograms per deciliter
mU/L = milliunits per liter

Low TSH value indicates an excess of thyroid hormone in the blood, as in hyperthyroidism, while high value indicates little thyroid hormone, as in hypothyroidism.


The content on this website is reviewed regularly and is updated when new information is made available. The information provided is neither intended nor implied to be a substitute for professional medical advice. You should always seek the advice of your Doctor.


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