TSH stands for Thyroid-Stimulating Hormone.
What does TSH mean?
a pituitary hormone that controls the thyroid gland
TSH stands for thyroid-stimulating hormone, a hormone made by the pituitary gland that tells the thyroid gland how much thyroid hormone to produce. It is the main screening test for thyroid function. A high TSH usually means an underactive thyroid (hypothyroidism), because the pituitary is working harder to stimulate a sluggish gland, while a low TSH usually means an overactive thyroid (hyperthyroidism). It works as part of a feedback loop with the thyroid hormones T3 and T4.
When is TSH used?
TSH is a routine blood test ordered in primary care and endocrinology to screen for and monitor thyroid disorders.
Frequently asked questions
What does TSH stand for?
TSH stands for thyroid-stimulating hormone, a pituitary hormone that controls the thyroid gland.
What does a high TSH mean?
A high TSH usually means an underactive thyroid, as the pituitary works harder to stimulate a sluggish gland.
What does a low TSH mean?
A low TSH usually means an overactive thyroid, or hyperthyroidism.
Why is TSH tested?
It is the main screening test for thyroid function and for monitoring thyroid treatment.