The risks of health impairment in laboratories can be caused by several causes: physical, biological but also chemical. Many chemicals are handled there, sometimes without sufficient precautions. About 50000 people work in french laboratories. No study allows us to know the percentage of affected individuals because it is not referenced anywhere.It is therefore important to know the health risks due to these chemicals, The great multiplicity of products used in different laboratories, the separation of tasks, sometimes leading to ignorance about the products used by other lab technicians, competition between laboratories, and industrial secrecy do not allow for localized studies for each group of laboratories. The analysis of chemical products can only be global about the different risks However preventive measures to be applied against the globally known risk and the toxicity of the referenced products.