Low-molecular-weight heparin (LMWH) represents a great expense in general hospitals. At the Centre Hospitalier Intercommunal de Créteil (CHIC), the Quality Assessment Council had set up a study on the prescription of LMWH in order to assess concordance between prescriptions and local guidelines on the preventive uses of LMWH. Adherence to the consensus was found in 73 per cent of cases, overprescription in 10 per cent of cases and underprescription in 26 per cent of cases. It is planned to modify the local consensus, taking into account some clinical situations highlighted by this study, and to perform another evaluation in the near future.