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The TSH level in your blood reveals how much T4 your pituitary gland is asking your thyroid gland to make. If your TSH levels are abnormally high, it could mean you have an underactive thyroid, or ...


Controversy Over Optimal TSH . While most laboratories define a normal TSH as between roughly 0.5 mU/l and 5.0 mU/l, some experts argue that the upper limit of a normal TSH should be lower (around 2.5 mIU/L) due to the fact that the vast majority of young adults without thyroid disease have a TSH value between 0.4 and 2.5 mIU/L.


If your TSH level is higher than it should be, you may have hypothyroidism. This occurs when the pituitary gland overcompensates for low amounts of thyroid hormone by pumping out more TSH.


TSH Blood Test. TSH, or thyroid stimulating hormone, is produced by the pituitary gland and tells the thyroid gland to produce and release T3 and T4, says Medline Plus 1.Normal lab values are 0.4 to 4.0 milliliters per deciliter; this range is less if under treatment for a thyroid disorder, at 0.5 to 3.0 milliliters per deciliter.


The TSH test is a standard test used to measure thyroid function. A doctor orders a TSH test if there are symptoms indicating an overactive or underactive thyroid gland, states MedlinePlus. High thyroid hormone levels, or hyperthyroidism, may present in cases of Grave's disease, thyroiditis or a goiter that contains abnormal growths, notes WebMD.


If your doctor won’t do the additional tests and insists on relying on TSH while you suffer symptoms, find a new doctor. Find a doctor who understands you are more than a lab number. There are good thyroid doctors out there. You also have the option to order your own thyroid lab tests. Do NOT settle. References: 1.


The normal, healthy range of a thyroid test result should be between 0.4 and 4.0 milli-international units per liter, states the National Institutes of Health's Medline Plus. The thyroid level is tested by submitting a sample of the patient's blood to a lab. Before a thyroid test can be completed, some medications should be avoided temporarily.


Blood tests for thyroid function—TSH, total T4, free T3, TSI, and others—are an important part of diagnosing and treating thyroid disorders. While some conclusions can be drawn from a single test, a combination of test results are usually needed to establish the full nature of your thyroid health.By comparing the values of thyroid tests, a doctor can determine whether a person has ...


The thyroid is the gland in your body that regulates metabolism. It produces two hormones--T4 and T3. The test must be combined with a test for TSH . Since your thyroid regulates your metabolism, symptoms of an overactive thyroid include sleeplessness, irritability, nervousness, weight loss and increased bowel movements.


What Every Woman Should Know About Thyroid Disorders. A blood test is critical to getting a proper read on how your thyroid is functioning.