--RESULTS: The average level of hemoglobin in stool was 31,98 ng/ml in patients with normal colonoscopy, 60,78 ng/ml in patients with haemorrhoids, 69,26 ng/ml in small and 788,47 ng/ml in large polyps, 773,29 ng/ml in patients with cancer and 577,41 ng/ml in inflammatory diseases. The differences between groups 1,2 vs. 3,4 were statistically significant TABLE 1: Heamoglobin in stool (ng/ml) Level of hemoglobin in stool1 - Normal Colonoscopy31,981h - Haemorrhoides60,782 - Polyps smaller than 10 mm 69,263 - Polyps 10 mm and larger788,474 - Cancer773,295 - Inflammatory Disease577,41