Packed red cells are stored in:
**Core Concept**
The storage of packed red blood cells (PRBCs) is crucial to maintain their viability and functionality for transfusion purposes. The optimal storage conditions for PRBCs must balance the need to preserve their oxygen-carrying capacity with the potential for degradation over time.
**Why the Correct Answer is Right**
PRBCs are typically stored in a solution that mimics the isotonic conditions of plasma, such as saline-adenine-glucose-mannitol (SAGM) or additive solutions. These solutions help to maintain the integrity of the red cell membrane and preserve the cell's ability to transport oxygen. The storage in these solutions slows down the process of red cell degradation, allowing for a longer shelf life of PRBCs.
**Why Each Wrong Option is Incorrect**
**Option A:** This option does not provide a viable storage solution for PRBCs. While plasma can be used to store PRBCs, it is not the standard or preferred solution due to its limited shelf life and potential for bacterial contamination.
**Option B:** This option is incorrect as it refers to a storage solution for platelets, not PRBCs. Platelet storage requires a different set of conditions to maintain their viability and function.
**Option C:** This option is not a valid storage solution for PRBCs. While some storage solutions may contain citrate, it is not a primary component for PRBC storage.
**Clinical Pearl / High-Yield Fact**
It is essential to note that PRBCs should not be stored for extended periods, as their oxygen-carrying capacity and viability decrease over time. Typically, PRBCs are stored for up to 21 to 35 days, depending on the storage solution and conditions.
**Correct Answer: A. SAGM solution.**