Note: The lab order will contain your name and date of birth. You cannot order lab tests for someone else.
Due to current laws, we cannot serve customers in MA, ME, NH, NJ, NY, and RI. HI, ME, and VT do not have lab locations.
T3 or triiodothyronine is the active form of the thyroid hormone. T3 acts as a metabolic throttle for fueling all of the daily cellular functions. Free T3 is the unbound portion of T3 that is biologically active.