Understanding the 4 Main Blood Types: A, B, O, and AB Explained #3896013 (License: Personal Use)

This illustration displays four standardized blood donation bags, each clearly labeled with one of the four primary ABO blood groups: A, B, O, and AB. The red fluid inside represents whole blood, and the labeling follows universal medical conventions for rapid identification during clinical use. These types are critical for safe blood transfusions, organ transplants, and prenatal care.

Used on health education pages, blood donation campaign sites, or medical resource hubs to explain ABO compatibility; matches user intent for learning basic hematology or preparing to donate blood.