TSH

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Endocrine glands Pituitary and TSH

Overview Risks Results

TSH

Normal values are from 0.4 to 4.0 mIU/L for those with no symptoms of an under- or over-active thyroid.

If you are being treated for a thyroid disorder, your TSH should be between 0.3 and 3.0 mIU/L. This means that you are being treated appropriately.

Some people with a TSH value over 2.5 mIU/L who have no signs (that is, no other abnormal thyroid function tests) or symptoms suggestive of an under-active thyroid may develop hypothyroidism sometime in the future. Anyone with a TSH above 2.5 mIU/L, therefore, should be followed very closely by a doctor.

Normal value ranges may vary slightly among different laboratories.

Greater-than-normal levels may indicate:

• Congenital hypothyroidism (cretinism)
• Primary hypothyroidism
• TSH-dependent hyperthyroidism
• Thyroid hormone resistance

• Hyperthyroidism
• TSH deficiency

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