What does a high TSH level mean?
A high TSH level indicates that thegland is not making enough hormone ( primary hypothyroidism). On the other hand, a low TSH level usually indicates that the thyroid is producing too much thyroid hormone (hyperthyroidism).
What is the normal TSH level?
TSH normal values are 0.5 to 5.0 mIU/L. Pregnancy, a history of thyroid cancer, history of pituitary gland disease, and older age are some situations when TSH is optimally maintained in different range as guided by an endocrinologist. FT4 normal values are 0.7 to 1.9ng/dL.
What are the symptoms of thyroid hyperthyroidism?
Primary Hyperthyroidism#N#A low TSH and a high thyroid hormone level (e.g. high FT4) can indicate primary hyperthyroidism. Primary hyper thyroidism occurs when the thyroid gland makes or releases too much thyroid hormone. Symptoms of hyperthyroidism can include tremors, palpitations, restlessness, feeling too warm, frequent bowel movements, disrupted sleep, and unintentional weight loss.#N#Causes of primary hyper thyroidism include: 1 Graves' disease 2 Toxic or autonomously functioning thyroid nodule 3 Multinodular goiter 4 Thyroid inflammation (called thyroiditis) early in the course of disease 5 Thyroid gland dysfunction due to a medication (e.g. amiodarone or cancer immunotherapy) 6 Excess thyroid hormone therapy
Why is my TSH low?
Occasionally, a low TSH may result from an abnormality in the pituitary gland, which prevents it from making enough TSH to stimulate the thyroid (central hypothyroidism). In most healthy individuals, a normal TSH value means that the thyroid is functioning properly.
What is the function of thyroid hormone?
It helps the body use energy, stay warm and keeps the brain, heart, muscles, and other organs working as they should. View larger image >. Thyroid hormone exists in two main forms: thyroxine (T4) and triiodothyronine (T3).
How is T4 converted to T3?
To exert its effects, T4 is converted to T3 by the removal of an iodine atom; this occurs mainly in the liver and in certain tissues where T3 acts, such as in the brain. T3 normally accounts for about 5% of thyroid hormone circulating in the blood. Most thyroid hormone in the blood is bound by protein, while only a small fraction is "free" ...
Which gland produces thyroid hormone?
Production of thyroid hormone by the thyroid gland is controlled by the pituitary, another endocrine gland in the brain. The pituitary releases Thyroid Stimulating Hormone (abbreviated TSH) into the blood to stimulate the thyroid to make more thyroid hormone.
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