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Hormone Tests
Free T4
Measures unbound, active thyroxine hormone. Used with TSH to evaluate thyroid function.
CPT code
84439
Turnaround time
24–72 hours
Fasting required
No fasting needed
Collection container
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About this test
Measures unbound, active thyroxine hormone. Used with TSH to evaluate thyroid function.
How to prepare
- 1
Bring a valid photo ID to your appointment
- 2
Plan for a 15–30 minute visit
Panels including this test
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