The aim of the research was to determine the satisfaction of patients diagnosed with colorectal cancer, with the actual bowel preparation prior to surgery, and the effectiveness of bowel emptying according to the protocol of a single procedure proposed by the authors. We studied two approaches of nurses to patients during mechanical bowel preparation. The first approach was connected with bowel emptying prior to planned surgery (according to the standard procedure of surgical wards), and the second one according to the protocol proposed by the authors. Data on patient satisfaction with the preoperative preparation were acquired using a questionnaire of our own design. The questionnaire was comprised of 26 questions compiled using the Likert scale. The reliability of the questionnaire was examined using the Cronbach alpha coefficient, and the resulting value was 0.906. Several statistical methods were used in the research: Chi-square test, F-test, Student's t-test, Mann-Whitney test, significance α = 0.05 and Cramer V coefficient. The examined issue was verified in the Slovak Republic and the Czech Republic in surgery clinics at the F.