What Is a Normal TSH Level?
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Significance
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A TSH level is drawn to monitor the effectiveness of thyroid hormone replacement medications and to diagnose a thyroid disorder or pituitary dysfunction.
The Test
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A blood sample for a TSH level is drawn by a phlebotomist or nurse from a vein in your arm or hand. The blood sample is sent to a laboratory for processing. Fasting is not required before having a TSH level drawn.
Results
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According the MedlinePlus.com, a normal TSH level is between 0.4 and 4.0 mlU/L. If you have a thyroid disorder and are receiving treatment, your physician may want to keep your thyroid level between 0.5 and 3.0 mlU/L.
Considerations
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Different laboratories may have slightly different normal ranges for a TSH level. Your physician will decide if your TSH level is abnormal.
Abnormal Levels
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An increased level of TSH may indicate thyroid dysfunction, infection of the thyroid gland, thyroid agenesis and congenital cretinism. A decreased TSH level may indicate pituitary dysfunction and hyperthyroidism.
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