Mean Reticulocyte Volume
The mean reticulocyte volume, or MRV, is the average size of your newest red blood cells (reticulocytes). Reticulocytes are naturally a bit larger than mature red cells before they shrink to their final size.
The size of your freshest red cells can offer clues about how they are being produced and what raw materials, such as iron, were available. It complements other reticulocyte and red cell measures when evaluating anemia. It is a specialized index that is rarely interpreted on its own.
A higher mean reticulocyte volume means your newest red cells are, on average, larger, which can occur in various states of active red cell production or when certain building blocks are affected. Because it is non-specific, it is interpreted alongside your reticulocyte count, hemoglobin, and red cell indices. Your clinician will place it in that broader context.
A lower mean reticulocyte volume indicates smaller young red cells, which may accompany conditions like limited iron availability, and is best interpreted with your other results.
This is an analyzer-specific index, so rely on your report's range and discuss it with your clinician alongside your other red cell markers.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.