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Thyroid

FT4 (Free Thyroxine 4)

Free Thyroxine (FT4) testing via the ELISA (Enzyme-Linked Immunosorbent Assay) method is a standard diagnostic tool for evaluating thyroid function. Unlike Total T4, Free T4 measures only the unbound, biologically active hormone, making it less susceptible to fluctuations in carrier proteins (like those caused by pregnancy or medications).


The FT4 result is almost always interpreted alongside the TSH (Thyroid Stimulating Hormone) level to pinpoint the exact nature of a thyroid disorder.


Sample Type
SST Vial
Fasting
No Fasting

Parameters Measured

T4 Free

Preparation

No special preparation or fasting is required for this test.

Frequently Asked Questions

Test Summary

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250399
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