Dear Arcojank,
i could not agree more with Bill.
Still there are one or two more things.
You have mentioned two different
tsh lab tests comparing them to each other. i know it is not your fault but i think you should have had the same test to be able to follow the results in a very objective manner. From 18 to 1.5 looks like it is surely going down but the scale was different from one test to the other so personally i don't know exactly what it means. By the way it takes about 6 weeks for the effect of the synthroid dose change to appear on the
tsh level in your blood, so if you had the test before that, it might have not reflected the true effect.
tsh is secreted by the pituitary gland and is not only affected by the synthroid you are taking but is also affected by another organ called the hypothalamus that secretes another substance that controls the release of
tsh.
i assume that the original cause of
hypothyroidism in your case was a problem within the thyroid gland itself and there was nothing wrong with the pituitary or the hypothalamus. If something starts to go wrong with either of them then the
tsh will be low all the time and even if you stop taking the synthroid altogether, your
tsh will still come back low. This is not a common occurrence and when it happens the only way to know whether a patient is getting enough synthroid is to check their thyroid hormone level in the blood directly.
Thank you very much for using our website
http://doctorslounge.com and i hope that this information helped.
Yasser Mokhtar, M.D.
