How to estimate the amount of gastrointestinal bleeding

First of all, according to the color and quantity of discharged blood, if the stool occult blood test is positive, it indicates that there is more than five milliliters of bleeding per day. If black stool occurs, it indicates that the amount of bleeding increases, most of which will be about 50 milliliters. For hematemesis, the amount of bleeding usually exceeds 200 milliliters.