The Biological Assay of Thyroactive Materials by the Goitre Prevention Technique

Abstract
The goitre prevention technique was employed to measure the biological activity of synthetic and natural thyroproteins as well as L-thyroxine and L-triiodothyronine. These studies indicated that L-thyroxine could not be used as a reference standard for natural thyroid preparations since the log dose response lines were not parallel. However, L-thyroxine was a suitable reference standard for the biological assay of the synthetic iodinated proteins