- A radioimmunoassay for 3,3',5'-L-triiodothyronine (reverse T3): assessment of thyroid gland content and serum measurements in conditions of normal and altered thyroidal economy and following administration of thyrotropin releasing hormone (TRH) and thyrotropin (TSH). Burman, K.D., Dimond, R.C., Wright, F.D., Earll, J.M., Bruton, J., Wartofsky, L. J. Clin. Endocrinol. Metab. (1977)