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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
Gold Top (SST)
About this test
Measures unbound, active thyroxine hormone. Used with TSH to evaluate thyroid function.
Specimen requirements
Collection container
Gold Top (SST)
gold top
Specimen
Serum
How to prepare
- 1
Bring a valid photo ID to your appointment
- 2
Plan for a 15–30 minute visit
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