Free T4 (FT4) Test in Bangalore
Measures unbound thyroxine (FT4) circulating in blood to evaluate thyroid gland output alongside TSH.
Thyroid & Endocrinology
1 Parameter
Serum (2 mL)
6 Hours
Preparation & Fasting Guidelines
Detailed Clinical Overview
Free T4 measures the fraction of thyroxine circulating in blood that is not bound to transport proteins. It is one of the most useful tests for assessing thyroid function together with TSH.
When TSH is abnormal, Free T4 helps determine whether thyroid hormone concentrations are increased, reduced or within the expected range.
Why Get Tested at QXL Diagnostics?
Frequently Asked Questions
Q: Why are TSH and FT4 tested together?
A: TSH indicates pituitary stimulation, while FT4 shows actual thyroid hormone production; testing both gives a complete picture.
Q: Should I take levothyroxine before my FT4 test?
A: Ask your treating physician; some doctors prefer blood drawn before taking morning thyroid medication.
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