Semantics as a field of study also has significant ties to various representational theories of meaning including truth theories of meaning, coherence theories of meaning, and correspondence theories of meaning. Each of these is related to the general philosophical study of reality and the representation of meaning.
packed-cell volume (PCV) hematocrit. plasma volume the total volume of blood plasma, i.e., the extracellular fluid volume of the vascular space; see also blood volume. red cell volume the total volume of red cells in the body; see also blood volume.
I think you mean MCV which means a mean corpuscular volume. This is a parameter for the mean volume of the measured erythrocytes or the average red blood cell size. When the MCV is low it means your red blood cells are averagely small and this is called microcytic (micro= small, cyte= cell).