Thyroid Stimulating Hormone General Overview
TSH (Thyroid Stimulating Hormones)
Measuring TSH levels is one of the primary ways of diagnosing whether an individual is suffering with thyroid diseases.
The functions of the thyroid gland are production storage and secretion of thyroid hormones (thyroxine T4) and triiodothyronineT3.Thyroxine is calledT4 because it contains four atoms of iodine and triiodothyronine is calledT3 because it contains three atoms of iodine.
The Thyroid stimulating hormone (TSH) is produced in the pituitary gland and controls production of thyroid hormones in the thyroid gland. TSH circulating in the blood is captured by thyrotropin receptors on thyroid cells and the TSH then stimulates the thyroid cells to make the thyroid hormones
The pituitary gland controls the thyroid gland like a thermostat controls the air conditioner. When thyroid hormone production goes down the pituitary gland senses it and secretes additional TSH and vice versa. This mechanism maintains the proper level of thyroid hormones in the blood.
If there are no obvious symptoms and if only the TSH level is abnormal the resulting disease is called subclinical. Individuals without any thyroid disease symptoms but increased TSH and normal hormone levels have subclinical hypothyroidism or mild thyroid failure. Individuals with decreased TSH and normal hormone levels have subclinical hyperthyroidism.
Measurement of TSH is one of the most accurate indicators of thyroid dysfunction. When TSH test results are abnormal, follow-up includes a physical examination, measurement of thyroid hormones and a repeat of TSH measurement.
If there is no TSH, the thyroid gland cannot make thyroid hormones. It is there important to know about elevated and decreased TSH levels which are the main cause of Thyroid diseases. Any TSH level over 3 is considered suspicious and anything over 4 one should consider treatment if accompanied by other symptoms or if you have a thyroid gland disease history.
Also, you could have a low thyroid despite normal TSH levels. So although TSH measurement can never be excluded in determining if you are suffering with thyroid diseases, you have to ask for other tests as well.
- Did you rapidly gain or lose weight without any change in your diet and exercise?
- Are you suffering with depression for more than two weeks?
- Are you aware that elevated or decreased TSH levels do not mean you are hypothyroid or hyperthyroid?
Fortunately, there are simple steps you can take to identify thyroid disease symptoms and manage and control your thyroid, so long as you know what critical mistakes not to make.
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About the Author
As a women who has hypothyroidism, I would like to share all of my knowledge to all of you about hypothyroidism and how can you make change of your life.