The free T3:reverse T3 ratio (free T3 in pg/dL over reverse T3 in ng/dL) compares active thyroid hormone with its inactive mirror, computed automatically from your thyroid panel.
A low ratio means more T4 is being turned into inactive reverse T3 than into active T3, a pattern seen with chronic stress, illness and heavy dieting.
Optimal Free T3:Reverse T3 Ratio: 10-28 ratio.
Typically re-tested every 12 weeks.