Low TSH

[PolyannaYorkshire]

My TSH level is 0.08..below low reference limit & T4 is 20.3.

Why is my TSH level so low? I take 150 mcg/day

[SeasideSusie Remembering]

Why is my TSH level so low?

Because your pituitary is satisfied that there is enough thyroid hormone.

Do you keep a record of your results, with reference ranges? What have your results been like in the past?

Is your FT4 over range or at the top of the range?

TSH is a signal from the pituitary to tell the thyroid to make hormone. If it detects there's not enough TSH will be high if thyroid hormone is low. If there is enough thyroid hormone then TSH will be low.

[PolyannaYorkshire in reply to SeasideSusie]

Thank you so much.. very helpful!!

[Montheone]

I found this on a Hashimotos Facebook page as my TSH is 0.002 at the moment and is starred on my results - lower than normal but no word from GP - am on 200mcg of levothyroxin

👉Free T4 should be in the TOP 1/2 of the range.⁠

⁠

👉TSH should be closer to 1.0 . ⁠

Note: If your are on natural desiccated thyroid medication or any T3-containing medication, your TSH will naturally be suppressed or below the reference range.

[Montheone in reply to Montheone]

Also said when TSH are below normal range but T4 are in normal range then T3 should be tested

[PolyannaYorkshire in reply to Montheone]

Don't think there's any chance my GP would have it checked...they haven't notified me about reducing my Thyroxine...Just found I have uterine cancer by reading my online GP notes...& they haven't notified me of that either!🥴

[Montheone in reply to PolyannaYorkshire]

Oh no ! Sorry to hear that - you should complain

[PolyannaYorkshire in reply to Montheone]

Bless you!

[PolyannaYorkshire in reply to Montheone]

Thank you for your help