What tests evaluate thyroid function?

The two most commonly used laboratory evaluations to test thyroid function are free T4 and thyroid stimulating hormone (TSH). Because over 99% of released thyroid hormone is attached to proteins in the blood, it is believed that measuring the amount not attached to proteins (i.e., free thyroid hormone) is a more accurate measurement of thyroid hormone levels. Measuring the total hormone level is generally less reliable 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.