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Thyroid Problems/Normal and Ideal Thyroid Levels


Dr. Kulkarni,

In the USA the 'normal' ranges for the different thyroid hormones create such a wide range of 'normal.'  How can we determine where in the 'normal' spectrum any particular individual should be with regard to his or her thyroid hormones, and if we supplement individuals on the low end of normal with something like levothyroxine to bring them closer to the middle or upper range of 'normal' are there any significant risks?



Hello Brian,
Warm welcome to you!
Normally we follow the guidelines of WHO. The current guide line says TSH range should be 0.3-3 before it was 0.4-4.5 or in some countries even 5.

But even some people fall in the range of 0.3-3 now, they show the symtoms of thyroid disorders. So if they are asymptomatic being in that range, its well and good, n considered to be normal. But some individuals though being in the range of 0.3-3 show many symptoms. In such situations we go by the symptoms rather sticking to lab values(if we are 100% sure).

For getting the diagnosis 100% right in such subclinical patients we refer a grading system in which the grades are given to symptoms according to their importance and percentage of subclinical patients showing such symptoms.

If the patients prove to be significantly symptomatic being in the borderlines of normal range then there is no harm in treating. But if they are asymptomatic and dont have any complaints then we can expose them to potential risk by treating them unnecessarily.

Hope that helps.

Take care. Have a great day. Bye.  

Thyroid Problems

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Dr.Shrinidhi Kulkarni


Dont hesitate to ask your health related queries. 24 X 7 ready to provide solutions to your health concerns. All questions are welcome ! Speciallly Endocrinology.


Working as a Doctor in Primary Health care Centre.

KIMS, Bangalore

MBBS, Intership in Internal Medicine

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