Lab
Free T4
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Free T4
Free T4, or thyroxine, is a hormone made by the thyroid gland. It helps show how well your thyroid is working and can help identify conditions like an under-active thyroid (hypothyroidism) or an overactive thyroid (hyperthyroidism).
What to Expect
Panel is drawn at Quest Labs. Locations are available nationwide. Fasting is preferred for more accurate results.
Details
Results
The turnaround time for results and Root doctor insights is typically 3–4 weeks post-draw. Once ready, the Root team will upload them to your personal Root dashboard and alert you for viewing.
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We're a team of doctors and dietitians who solve hormone, gut, and autoimmune issues at the Root cause.
