[Insulin].

After a short survey of the different methods for the radioimmunological dosage of insulin, the significance of insulinaemia in fasting conditions and of the insulinaemic curves after stimulation is taken into consideration as regards some physiological aspects. Dosage of insulin in the study of various pathological conditions, such as obesity and diabetes, is throughly examined, also in order to point out its possible diagnostic limitations. The kinetic aspects concerning the hormone situation and requiring the knowledge of other parameters are studied. The remarkable diagnostic usefulness of insulinaemia measurement in the differential diagnosis of hypoglycemic syndromes is pointed out.