fT3

in Serum

Also known as:

Free Triiodothyronine

S-fT3

Free T3

pg/mL

ng/L

pmol/L

Enter value to interpret your result

Optimal fT3 reference ranges for longevity

According to Peter Attia, fT3 should be between 2.8 and 4 pg/mL

To see these ranges in your preferred unit, enter your lab result above.

This page is marked as a work-in-progress. Expect updates and a redesign soon.

About the site author
My personal mission is to extend human lifespan by collectively adding 1 million years to people's lives.
Zsolt Szabo
Software Engineer, Biohacker, and Consultant for Longevity Clinics.

Please send me studies and feedback.

Any feedback is welcome at .

I am particularly interested in research on biomarkers linked to all-cause mortality or optimal reference ranges.