Why to get tested?
To help evaluate thyroid gland function; to diagnose thyroid disease, including hyperthyroidism, and determine the cause; to monitor effectiveness of treatment of a thyroid disorder
When to get tested?
When you have an abnormal TSH, particularly with a normal free T4 result, and/or signs and symptoms of hyperthyroidism
What sample needed?
A blood sample taken from a vein in your arm
What preparation I need before test?
None needed; however, certain medications can interfere with the free T3 and total T3 tests, so tell your health practitioner about any drugs that you are taking.