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
Root labs are drawn at Quest Labs available nationwide. Fasting is required for most labs. Please check for a location near you before purchasing.
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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