How do you read blood test results for thyroid functions?


Quick Answer

The normal level for thyroid stimulating hormone level is between 0.4 and 4.0 milli-international units per liter, according to MedlinePlus. The TSH level, is most commonly checked by physicians who wish to evaluate whether or not their patients have normal functioning thyroids, according to Lab Tests Online.

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Full Answer

A TSH blood test measures the concentration of thyroid stimulating hormone in a patient's blood, according to MedlinePlus. This hormone is naturally produced by the patient's pituitary gland and controls the release of other thyroid hormones into the blood.

If a patient has high TSH levels, it may indicate the he has an underactive thyroid gland that isn't producing or releasing enough thyroid hormones, according to Lab Tests Online. If a person has low TSH levels, then it may indicate that he has an overactive thyroid gland that is producing too much thyroid hormones. If a patient has high or low TSH levels then his thyroid will be unable to produce the correct concentration of thyroid hormones. Other lab tests that may be ordered to check a patient's thyroid hormones include a T3 and T4 test. These check the level of the patient's thyroid hormones to determine the root cause of a patient's thyroid disorder.

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