Thyroxine- Free (FT4)

250

This test measures the level of free T 4, or free thyroxine, in your blood. A free T 4 test is used to find out how well your thyroid gland is working. T 4 is 1 of 2 hormones produced by the thyroid, a butterfly-shaped gland in your neck.

Test information: Fasting not necessary, but preferred

Reporting: Within 6 hours*

  • Fasting is not necessary but preferred.
* For details, please see service-related policies

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