TSH Levels: Normal Range for TSH

TSH test is conducted to determine the amount of thyroid stimulating hormone in the blood. To know more about TSH levels normal range and its importance, read on.
Thyroid gland, which produces hormones that get discharged in the blood, is situated in the neck. Thyroid stimulating hormone or TSH is released by the pituitary gland located at the base of the brain. The function of thyroid stimulating hormone is to activate the thyroid gland for secretion of thyroid hormones. Pituitary glands command thyroid glands to produce and secrete T3 (triiodothyronine) and T4 (thyroxine) hormones, associated with thyroid levels. It is very important to maintain TSH levels normal range. The following TSH levels chart will help you to know what is the normal range for TSH levels.

TSH Level Category TSH Level Result
Normal TSH Level 0.4 - 4.0 mIU/L
Thyroid Disorder 0.5 - 3.0 mIU/L
Under Active Thyroid 2.0 mIU/L or more

As we can see from the chart, TSH levels normal range is 0.4 - 4.0 mIU/L. Yet, people without signs of abnormal thyroid, showing TSH result 2.0 mIU/L and normal T4 test results, may acquire thyroid problems later, such as hypothyroidism. Above normal levels hint at thyroid hormone resistance, cretinism, exposure to mice, primary hypothyroidism or TSH dependent hypothyroidism, whereas below normal levels indicate TSH deficiency or hyperthyroidism. It is very important to maintain normal TSH levels since hypothyroidism would trigger severe difficulties such as muscle cramps, constipation, frequent menstruation, weariness and increased weight, and hyperthyroidism can lead to weight loss, diarrhea, irregular menstruation and nervousness. Hyperthyroidism is commonly observed in women as compared to men.

Causes of High and Low TSH

Hashimoto's thyroiditis is the most common triggering agent of hypothyroidism. Rarely, a pituitary gland tumor secreting excess TSH can be observed. Factors triggering hyperthyroidism are toxic multinodular goiter, grave's disease or a damage to the pituitary gland which decelerates the making of TSH.

When is TSH Test Recommended?

Whenever a person shows hyperthyroidism, which is the overproduction of thyroid hormones by the thyroid glands, or hypothyroidism, which is the under production of thyroid hormones by the thyroid glands, the doctor recommends a TSH test to be done.

Preparation for The Test

You are required to terminate the use of certain medication which may intervene with the test. These drugs include potassium iodide, amiodarone, lithium, prednisone, dopamine and anti thyroid medication. Your test results may also get affected if you had an X-ray within the last 4-5 weeks of performing the thyroid levels test.

TSH Test Procedure

During the test, usually, blood is extracted from the back of the hand or from inside the elbow. The area is washed with an antiseptic. To make the vein inflammate with blood, an elastic band is wrapped around the upper arm, followed by needle insertion in the vein. The band is unwrapped after blood gets collected in the vial. The needle is then taken off. To stop the bleeding, a cotton ball or gauze pad is pressed on the site. In case of infants, lancet can be used to prick the skin for bleeding and a pipette can be used for collecting the blood.

Risks Associated with the Test

People suffering from bleeding disorders are prone to the danger of excess ongoing bleeding, which gets triggered due to the blood thinning medication. Rarely, phlebitis or an inflammation of the veins after extracting blood may occur.

These were the facts associated with TSH levels normal range and TSH test. The treatment for abnormal TSH, i.e. hypothyroidism treatment or hyperthyroidism treatment depends upon the deciding factor, which is TSH level result. Based on the status, your doctor will recommend hypothyroidism medication or hyperthyroidism medication. You can go in for natural remedies such as acupuncture and herbal methods as well to maintain TSH normal range. It's imperative though, that you consult your physician. As we know, an old adage saying, 'an ounce of prevention is worth a pound of cure'. Follow a well-balanced diet, for instance hypothyroidism diet and getting vaccinated, will keep you away from progression to acute disease.
By Amigo G
Published: 10/23/2010
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