The amount of upper gastrointestinal bleeding can be roughly determined by observing the shape and color of stool and symptoms such as vomiting blood and blood in stool. For example: 1. If the color of stool is normal with naked eyes and the result of routine stool test is positive for occult blood, it means that the current bleeding volume is around 5 ml, and will not be more than 50 ml at the most. 2. If the color of stool is black or dark red with naked eyes, the bleeding volume should be between 50-100 ml. 3. If the shape and color of stool is tarry and black rimmed or dark red, the bleeding volume should be around 300-500 ml, accompanied by symptoms such as nausea, vomiting, vomiting blood, etc. 4. 300-500ml or so, accompanied by nausea, vomiting, vomiting blood and other symptoms.4. If there is vomiting blood or blood in the stool within a short period of time, the bleeding volume is relatively large, panic, sweating, blood pressure drops, heart rate accelerates and so on, the bleeding volume is more than 1,000 ml, or even more than 1,500 ml, and some people will experience shock, coma and other symptoms.