When a public health establishment, or a private not-for-profit health establishment, has a medical biology laboratory organised in the form of an activity centre or a university hospital centre, the biologist in charge is the head of this centre and is responsible for its functions. The organisation of the laboratory is, depending on the case, either that of the activity centre or that of the university hospital centre.
When a healthcare establishment has a medical biology laboratory which is not organised in the form of an activity unit or a university hospital unit, this laboratory is directed by a biologist in charge.