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What is TSH? What does it mean to have high TSH Levels?

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hi i was wondering if u can tell me wot tsh is or wot it does. i attend the infertillity clinc and they had done blood tests it came bk saying my baseline hormone levels are ok but my tsh is slightly raised its sumthing to do with my thyroid.i am over weight could this have sumthing to do with it.
thanx debbie

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replied May 26th, 2006
Infertility Answer A966
Thyroid stimulating hormone (TSH) is a hormone produced by the pituitary gland. Its task is to stimulate the thyroid gland to produce thyroxin. Thyroxin is a very important hormone responsible for many functions in the body, including reproduction. TSH is raised during two principle scenarios. The first, when the thyroid gland produces a low amount of thyroxin, causes the pituitary gland to react and want to stimulate the thyroid gland to produce more thyroxin by producing more TSH. In that case, TSH levels are high and thyroxin levels are low (or normal) in the body. The second situation finds the pituitary gland producing more TSH, regardless of the level of thyroxin in the body. In this cas,e both TSH and thyroxin levels are high. Besides increased TSH, it seems that you also have another hormonal disorder, poly-cystic ovarian syndrome (PCOS). Obesity and sterility are symptoms of PCOS. You can check your blood levels for testosterone, DHEA, and insulin at your GP's office.
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