TriIodothyronine Free

Test Results & Interpretations

Overview of TriIodothyronine Free

Test Description

Also known as FT3 or total triiodothyronine test, it is used to measure the unbound and free T3 levels present in the bloodstream of the body. The test assesses the functioning of the thyroid gland to help diagnose hyperthyroidism, hypothyroidism or other thyroid disorders.

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 other than water for 8-12 hours before the test.

What Results of TriIodothyronine Free mean?


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.

Provided By



Gen-X Diagnostics is a unit of ARA Healthcare Pvt. Ltd. founded by leading applied research scientist Dr. Rama Mukherjee. Gen-X specializes in the field of molecular diagnostics, focusing on the development of genetic, biological and molecular diagnostic services. It is one of the first of its kind R&D Company focusing on development of genetic, biological and molecular diagnostic services with an intention to assisting its global partners in shortening the cycle and lowering the cost of drug discovery and development by providing cost effective and efficient co-development and outlicencing solution. Gen X Diagnostics is a unique leading Molecular Diagnostics in India offering a wide range of tests for infectious diseases, transplantation medicine, prenatal diagnostics, cancer, genetic disorder, metabolic and hormonal disorders. Gen-X Diagnostics has started its diagnostics operation from Dec 2007. We do reflect a commitment to improving the lives through the delivery of innovative diagnosis and therapeutic products that enable and provide optimal care.

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