[Genetic counseling and risk]

From their own experience, the authors try to expose the concept of risk, an abstract and difficult one to express realistically. Successively are exposed the concept of risk after several accidents and after a first occurrence of an hereditary affection in a sibship; the concept of empiric risk; the probability of an "accident" in some circumstances (inbreeding, possible prenatal diagnosis of chromosomal abnormalities, possibly teratogenic agents during the pregnancy). They expose the concept of risk for geneticist, by phrasing the problem of the necessity or the possibility for the genetic counseling to be leading and they study the referrals' reaction in front of the genetic risk.