TSH is a hormone that acts as a messenger to the thyroid gland. When released by the pituitary gland—a small gland at the base of the brain—TSH stimulates the thyroid to produce more thyroid hormone.
A high TSH suggests your thyroid is underactive (hypothyroid) and not doing its job of producing enough thyroid hormone.
A low TSH suggests your thyroid is overactive (hyperthyroid) and producing excess thyroid hormone.

TSH:

It's important to understand the meaning of both high thyroid-stimulating hormone (TSH) and low TSH. This applies whether you're living with thyroid disease or having your first thyroid test.
TSH test results can be confusing. A high TSH level points to hypothyroidism (underactive thyroid). A low TSH might mean hyperthyroidism (overactive thyroid). But there are exceptions to these interpretations, as well as what a "normal" level means for you.

What is a TSH test?

Ans: TSH stands for thyroid stimulating hormone. A TSH test is a blood test that measures this hormone. The thyroid is a small, butterfly-shaped gland located near your throat. Your thyroid makes hormones that regulate the way your body uses energy. It also plays an important role in regulating your weight, body temperature, muscle strength, and even your mood. TSH is made in a gland in the brain called the pituitary. When thyroid levels in your body are low, the pituitary gland makes more TSH. When thyroid levels are high, the pituitary gland makes less TSH. TSH levels that are too high or too low can indicate your thyroid isn't working correctly.

What is it used for?

Ans: A TSH test is used to find out how well the thyroid is working. 

What happens during a TSH test?

Ans: A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.

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