Why Get Tested
The FT3 test is used to evaluate the thyroid gland function, to diagnose disorders like hyperthyroidism which has symptoms like nervousness, tremors, insomnia, weight loss and swollen eyes. It also diagnoses hypothyroidism with symptoms like weight gain, slow metabolism, dry skin, constipation and fatigue. FT3 test also monitors the effectiveness of the thyroid treatment.
Do not eat or drink anything except water at least 9 to 12 hours before the test.
The results show either excessively high or low levels of free T3 in the blood samples. The normal range for free T3 is from 1.8 to 5.4 mcg/dl for men and women of all age groups.