Men that undergo an early detection investigation should be informed of the advantages and disadvantages as well as of the therapeutic consequences. In this study the quality of information was checked using the state of scientific knowledge of the patients.An informative consultation was carried out before the early detection investigation using a clarification brochure and an examination by a urologist. A questionnaire was also filled out after the investigation. A total of 1,536 men were questioned. Although 47% of the men had previously undertaken a PSA at least once, only 55% knew their own test result. Subjectively 82% of men felt well informed. In contrast one-third did not know the significance of an increased PSA level. In the field of patient clarification for the early detection for prostate cancer there are considerable deficits but the information received was considered adequate by the participants. However, more than one-third did not understand the significance of the PSA level.