Diagnostic test
FREE THYROXINE (FT4)
About test
What does FREE THYROXINE (FT4) measure?
The Free Thyroxine (FT4) test measures the level of free thyroxine, a thyroid hormone circulating in the blood that helps regulate metabolism and energy use. It may be used along with other thyroid tests, such as TSH, to evaluate thyroid function, investigate suspected hormone imbalance, or monitor certain thyroid-related conditions. Results are interpreted in the context of other test findings and clinical information.
This overview is educational. Use the recorded preparation, sample and lab-partner details below for collection guidance, and confirm any missing information before collection.
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Thyrocare
- Sample for analysis
- Confirm with the collection team
- Report time
- To be confirmed
Preparation and specimen requirements can vary by test and laboratory. Follow the instructions shown for your selected partner and any advice from your healthcare professional.