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Testing Details: 

Why Get Tested?

To help evaluate thyroid gland function; to help diagnose hypothyroidism or hyperthyroidism; to screen for hypothyroidism in newborns

When to Get Tested?

Usually ordered in response to an abnormal TSH test result or when a person has symptoms of hyperthyroidism or hypothyroidism; commonly performed as a screening test on newborns

Sample Required?

A blood sample drawn from a vein in the arm or from pricking the heel of an infant

Test Preparation Needed?

None needed; however, certain medications can interfere with the T4 test, so tell you doctor about any drugs that you are taking.

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