Diagnostic Blood Test:
The T3 thyroid hormone plays vital roles in metabolism, muscle growth, fat loss, heart rate, and mental function. T3 is moved through the body by certain proteins. T3 Uptake testing measures how much hormone these proteins are able to carry and how much T3 is available to the body’s tissues.
Note: This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin. Cease biotin supplementation at least 72 hours prior to blood draw.