Psychiatric comorbidity of general hospitals inpatients leads to complicated courses of illness and to increased health car costs as compared to patients that suffer from somatic illnesses alone. Such patients are cared for by psychiatric Consultation-Liaison (CL) services. When analyze guidelines that deal with the organization of psychiatric CL-services in USA and the UK, as well with a guideline developed for psychosomatic CL-services in Germany, and an Dutch guideline released in 2008

Literature search and review of guidelines.

Existing guidelines in CL-psychiatry are in part controversial with regard to recommendation for treatments, preferences as to concentrate on clinical, or on organizational issues, and differ even in the grade of evidence given to single topics, such as effectiveness of CL-interventions.

To improve the efficiency of CL-psychiatry, guidelines might be important, as well for the treatment of psychiatric diseases in general, but even more so for diseases that are frequent in general hospitals such as delirium. However, reliability of guidelines in CL-psychiatry differing among countries should be improved.