Doctor insights on:
Few possibilities: These labs seem at odds, with TSH suggesting overactive thyroid and ft4 underactive thyroid. Free T4 tests can be inaccurate in some people who have interfering substances present. Another possibility is a tumor in the pituitary secreting too much TSH resulting in thyroid overactivity, and high thyroid hormone levels. This is quite rare, however. Your doctor can help sort this out. ...Read more
3.1 Prolactin level? Pituitary Microadenoma TSH levels up and down, no other tests done. Is this level okay?
Had TRH (thyrotropin) stim test to evaluate pituitary/thyroid func.TSH base=3.27 TSH @ 0, 30, 60 min, respectively 1.48, 1.34, 1.10, opposite of norm?
TRH Stim Test: You are right. TSH should have elevated from TRF infusion. The flat response indicates pituitary hypofunction. This can be due to adenoma, pituitary "infarction" with pregnancy delivery associated blood loss and hypotension, or surgical removal. (You would be aware of that for sure...). So, MRI is essential. And some other hormone testing, such as ACTH and cortisol, prolactin, etc ...Read more
Controversy surrounds those patients with a suppressed tsh. Isn't it true that when a hypothyroid patient starts taking exogenous th, a negative feedback system reduces the pituitary gland's output of tsh. This decreases the thyroid gland's output of en
Endo feedback: With primary hypothyroidism, TSH is elevated in an effort to push the thyroid gland to make more thyroxine. Treatment with levothyroxine indeed signals the pituitary to reduce TSH output. Secondary is when either/or pituitary +/- hypothalamus is damaged but unable to produce tsh. Then, thyroxine levels drop but the pituitary can't respond. Tsh can't monitor treatment but free T4 levels can. ...Read moreSee 1 more doctor answer
What can cause low TSH of its not a Thyroid or pituitary problem? 0.01 TSH T3 (liothyronine) and T4 free normal, graves and hasmitos negative
2 possibilities: Hi. First of all, Hashimoto's doesn't cause a suppressed TSH, and YES, your TSH is SUPPRESSED, not "low", because your free T4 and total T3 (liothyronine) are "normal". A low TSH (pituitary defect) would cause low free T4 and possibly/probably low T3 (liothyronine). The most likely is a "hot" thyroid nodule (autonomously hyper-functioning); second most likely would be a phase of subacute thyroiditis. Follow over time to tell. ...Read more
Pituitary failure responsible for hypo or hyperthyroid & TSH goes to low or high side of normal range?
Tumor forming TSH: TSH-secreting pituitary adenomas are benign tumors of the pituitary gland. They produce too much thyroid stimulating hormone (TSH) which causes the thyroid gland to enlarge and produce thyroid hormone in excess, leading to an overactive thyroid (hyperthyroidism) .most common initial therapy for patients with a TSH-secreting pituitary adenoma is transphenoidal resection of the tumour. ...Read more
Could TSH 0.6 & ft4 0.9 & extreme fatigue/low body temp possibly suggest pituitary problems? More workup or seek other etiology?
Work up: Hopefully, you have been referred to an endocrinologist to discuss these laboratory results. Single values in a vacuum often do not tell the whole story, and the hypothalamic, pituitary, thyroid, end organ axis can have a number of reasons for these results. Best to discuss with the person who ordered the tests to get an appropriate referral and make sure you're up to speed with the plan. ...Read more
Tsh has gone to .007 to .02 now .07 still very low! my Synthroid (thyroxine) 88 my lowest dose ever. Is this showing another problem? Pituitary?
Appropriate: Your TSH level should go higher (as it has) as your dose of thyroid hormone is lowered. Tsh, a pituitary hormone which regulates thyroid output, moves inversely with the level of thyroid hormone. You latest level indicates your current dose of medicine is still higher than you need. You may need a very small dose. It's even possible that, at least for a while, you may need none at all. ...Read more