A healthy result should fall into the range 2.6 - 4 pmol/L.

Triiodothyronine or T3 is the most biologically active thyroid hormone in humans. The term “free T3” means the amount of T3 that is not bound to proteins in the blood. T3 acts on almost every cell in the body by setting the metabolic rate of the cell. T3 is also critical for growth and development, especially in fetuses and children. The thyroid gland produces and releases some of the T3 in the blood, but about 80% of T3 is produced from T4 or thyroxine in the liver, kidney, and thyroid tissue. Thyroid-stimulating hormone, also known as TSH or thyrotropin is produced in the pituitary gland an stimulates the release of T3 by the thyroid gland. Most clinical laboratories do not directly measure of free T3. Instead, they measure total T3 and thyroid hormone-binding index.

Normal Ranges for Free T3:

1-23 Months 3.3-5.2 pg/mL

2-12 Years 3.3-4.8 pg/mL

13-20 Years 3.0-4.7 pg/mL

>20 Years    2.3-4.2 pg/mL

 

Sources:

http://www.ncbi.nlm.nih.gov/books/NBK285568/

http://www.uptodate.com/contents/laboratory-assessment-of-thyroid-function

http://www.ncbi.nlm.nih.gov/pubmed/12625976

http://www.questdiagnostics.com/testcenter/BUOrderInfo.action?tc=34429&labCode=SJC

http://dx.doi.org/10.1001/jama.1990.03440110095035

http://www.uptodate.com/contents/thyroid-function-in-nonthyroidal-illness

http://www.ncbi.nlm.nih.gov/pubmed?term=7920008

http://www.ncbi.nlm.nih.gov/pubmed/6687730

http://www.uptodate.com/contents/overview-of-thyroid-disease-in-pregnancy

http://www.uptodate.com/contents/diagnosis-of-and-screening-for-hypothyroidism-in-nonpregnant-adults

https://www.uptodate.com/contents/diagnosis-of-hyperthyroidism

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