Free T4 measures the free, unbound thyroxine levels in your bloodstream. Free T4 is typically elevated in hyperthyroidism, and lowered in hypothyroidism. Free or unbound T4 levels represent the level of hormone available for uptake and use by cells. Because the free levels of T4 represent immediately available hormone, free T4 is thought to better reflect the patient’s hormonal status than total T4.
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Quentin Caswell, MSN, is an Integrative and Functional Medicine Specialist dedicated to helping patients feel their best. Board certified in advanced bioidentical hormone replacement and peptide therapy, he earned his Master of Science in Nursing from the University of Missouri (Mizzou) and opened Advanced Practice Wellness Clinic in 2011.