Diagnostic test
TOTAL THYROXINE (T4)
About test
What does TOTAL THYROXINE (T4) measure?
This test measures total thyroxine (T4), a hormone produced by the thyroid gland, including both protein-bound and free T4 in the blood. It may be used to help evaluate thyroid hormone production and investigate suspected thyroid function changes, often alongside other thyroid tests such as TSH. Results are interpreted in the context of medical history, symptoms, medications, and related laboratory findings.
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.