What does the term "packed red blood cells" refer to?

The term "packed red blood cells" specifically refers to red blood cells that have been separated from plasma and other blood components. This process is accomplished through centrifugation, where the heavier red blood cells settle at the bottom of the collection bag, allowing the lighter plasma to be poured off, leaving behind concentrated red blood cells.

Using packed red blood cells is crucial in transfusion medicine, as they can be administered to patients to treat conditions such as anemia or significant blood loss without the volume of plasma, which may not be necessary in these cases. Additionally, this product is often stored in a preservative solution to extend its shelf life.

Whole blood, while containing red blood cells, plasma, white blood cells, and platelets, is not the same as packed red blood cells, which are a more refined product specifically designed for transfusions aimed at improving oxygen delivery without the additional fluid volume.