Reverse T3 is an inactive form of the thyroid hormone Triiodothyronine (T3).
Sources:
- Gomes-Lima C. et al. Can Reverse T3 Assay Be Employed to Guide T4 vs. T4/T3 Therapy in Hypothyroidism? Front Endocrinol (Lausanne). 2019; 10: 856. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6917573/ (accessed 8. August 2020)
- Mayo Clinic Laboratories. T3 (Triiodothyronine), Reverse, Serum. https://www.mayocliniclabs.com/test-catalog/Clinical+and+Interpretive/9405 (accessed 8. August 2020)