Organ transplant operations are regularly carried out in Switzerland at 6 transplantation centres. Between January 1995 and October 1996, 119 patients at Zurich University Hospital completed a semistructured psychiatric interview and the Transplant Evaluation Rating Scale (TERS). Inclusion criteria comprised all indications for organ transplant. Diagnostic evaluation was according to ICD-10. Of the 44 women and 75 men (mean age 40.2 years), 48 required a heart transplantation (HTPL), 37 a liver transplantation (LETPL), and 34 lung transplantation (LUTPL). 39 patients (32.8%) had one, and 15 (12.6%) 2 current psychiatric disorders. 65 of the 119 patients (54.6%) were without a current psychiatric disorder. The candidates for lung transplantation were the most psychologically healthy (68% had no psychiatric disorder). Approximately half of the heart and liver patients had at least one psychiatric disorder. The LETPL group had the highest prevalence of psychiatric comorbidity, with organic brain disorders present in a third of the patients. A quarter of all patients had stress disorders, panic disorder or a somatoform disorder. Full criteria for an affective disorder were not met by any patient. 61% enjoyed good to excellent family and social support, 29% had an unresolved conflict, and 11% had strong conflicts. Earlier coping behaviour appeared to be good to excellent in 57%, sufficient in 37%, and poor in 6%. Estimated compliance rate was found to be complete in 87%, partial or involving problems in 12% and unsatisfactory in 1%. We conclude that in transplant candidates psychiatric disorders and psychosocial problems are frequent and must be considered regularly during evaluation and the transplantation process. The results of this analysis and 3 case examples and the results of the study show the clinical importance of a detailed psychiatric and psychosocial examination as part of the evaluation of patients about to undergo life-saving organ transplant operations.