A healthy result should fall into the range 80 - 200 ng/mL, or 8000.00 - 20000.00 ng/dL.

Triiodothyronine or T3 is the most biologically active thyroid hormone in humans. It is called total T3 because it includes both free T3 and T3 bound to proteins. T3 acts on almost every cell in the body by setting the metabolic rate of cells. T3 is critically important for growth and development, especially in fetuses and children. The thyroid gland produces and releases T3 into the blood; however, four-fifths of T3 is formed by the conversion of another thyroid hormone T4 (thyroxine). This takes place in the liver, kidney, thyroid, and other tissues. Free T3 is the biologically active portion of total T3. Approximately 99.5% of T3 in the serum is bound to serum proteins such as thyroxine binding globulin (TBG).

Normal Ranges for Total T3:

Adult (> or =20 years): 80-200 ng/dL

0-5 days: 73-288 ng/dL

6 days-2 months: 80-275 ng/dL

3-11 months: 86-265 ng/dL

1-5 years: 92-248 ng/dL

6-10 years: 93-231 ng/dL

11-19 years: 91-218 ng/dL

 

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

https://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/8613

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

http://www.uptodate.com/contents/thyroid-hormone-synthesis-and-physiolog

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