Gender for
Male, Female
Report Time
8 Hours
Sample Type
EDTA Whole Blood
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. There are 2 forms of T 4.
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Doctors
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Widest Range
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Schedule a blood test or health checkup at home.
On FT4