Biological substances: International standards and reference reagents, 1990

International biological standards and international biological reference reagents provide a means of ensuring uniformity throughout the world in the designation of the potency or activity or preparations used in the prophylaxis, therapy, or diagnosis of disease, where this cannot be expressed in terms of physical or chemical quantities. The list of standards and preparations is brought up to date every few years. This latest revision incorporates all changes made since 1987, including those contained in the third-seventh, thirty-eighth, thirty-ninth and fortieth reports of the WHO Expert Committee on Biological Standardization.