What is the bleeding volume of melena?

Hematemesis We generally think that bleeding volume is more than 100ml, of course, black stool is generally considered to be upper gastrointestinal bleeding, such as gastric bleeding, duodenal bleeding caused by lesions. Patients may simply perform black stool, not accompanied by hematemesis. Hematemesis We generally think that bleeding volume is more than 250ml, can show hematemesis. Therefore, for patients with gastrointestinal bleeding, it is recommended that patients improve some tests, such as blood routine, ECG, gastroscopy, etc. The most important part of blood routine is to evaluate anemia. If anemia is obvious, it is recommended that the patient transfuse some red blood cells to correct anemia. Gastroscopy is the most important examination, mainly to clarify the cause of bleeding, whether there is erosion of stomach and duodenal mucosa, ulcer, or even tumor formation, so it is recommended that the patient improve gastroscopy. Treatment of this piece is symptomatic treatment, gastric protection and hemostasis, symptomatic treatment.