Diagnostic test
FREE TRIIODOTHYRONINE (FT3)
About test
What does FREE TRIIODOTHYRONINE (FT3) measure?
This test measures free triiodothyronine (FT3), the unbound form of a thyroid hormone circulating in the blood. It may be used with other thyroid tests to help assess thyroid hormone activity and investigate possible overactive or underactive thyroid function. Healthcare professionals may also order it to monitor known thyroid conditions or evaluate changes in thyroid hormone levels.
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.