Differential diagnosis of anemia caused by upper gastrointestinal hemorrhage

Anemia caused by upper gastrointestinal bleeding is more common in iron deficiency anemia or normal cell normochromic anemia. Its differential diagnosis mainly includes: 1. Blood routine examination, vitamin B12, bone marrow puncture and other examinations to identify whether megaloblastic anemia occurs. 2. Gynecological color Doppler ultrasound to identify whether iron deficiency anemia occurs.