Prediction of flare-ups of ulcerative colitis using quantitative immunochemical fecal occult blood test

Figure 1 A histogram of hemoglobin concentrations in 823 fecal samples. The distribution of hemoglobin concentration in 823 fecal samples from 78 UC patients is shown. The median concentration was 41 ng/mL (0-392 500 ng/mL). More than 50% of fecal samples exhibited values between 0 and 100 ng/mL. Approximately 20% were between 100-1000 ng/mL, 15% were between 1000-10 000 ng/mL, and the remaining 7% of samples exhibited values more than 10 000 ng/mL. In general, stools with a hemoglobin concentration more than 1000-10 000 ng/mL were recognized as bloody stools.