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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Does Low TSH Level Indicate?

My 5 year old has joint pain, low grade fevers, and recently showed a "low tsh level"...his pediatrician told me this was hypothyroidism (As an RN, I thought low tsh indicated hyperthyroidism) and she is sending him to an endocrinologist with a diagnosis of "autoimmune thyroiditis"...I am confused, as it is my understanding that thyroiditis was associated with high level tsh...Are low TSH levels associated with thyroiditis? How did she make this diagnosis without his T3, T4, and antithyroglobulin levels?
posted on Thu, 13 Mar 2014
Twitter Thu, 22 Dec 2016 Answered on
Twitter Fri, 23 Dec 2016 Last reviewed on
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Endocrinologist,  's  Response
Hello,
I read carefully your concern.
You are totally right, a low TSH is suggestive of hyperthyroidism and it is confirmed by high levels of FT4 and FT3.
Hyperthyroidism can also be caused by autoimmune thyroiditis (Graves'Disease), confirmed by anti TSH receptor antibodies.

For a personalised comprehensive evaluation, treatment recommendations, or individual therapy, ask me at HealthCareMagic at this private link:
HCM Dr. Guni

Kind regards,
Dr.MIrjeta

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What Does Low TSH Level Indicate?

Hello, I read carefully your concern. You are totally right, a low TSH is suggestive of hyperthyroidism and it is confirmed by high levels of FT4 and FT3. Hyperthyroidism can also be caused by autoimmune thyroiditis (Graves Disease), confirmed by anti TSH receptor antibodies. For a personalised comprehensive evaluation, treatment recommendations, or individual therapy, ask me at HealthCareMagic at this private link: HCM Dr. Guni Kind regards, Dr.MIrjeta