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A low RDW (below 10.2%) means that the red blood cells vary very little in size. One reason for a low RDW level is macrocytic anemia. Another cause of a low RDW level is microcytic anemia. In these two disorders the red blood cells do not vary much in size because they are either all small or all large.
Hi Anjum, Unfortunately kidney disease can cause low hemoglobin levels when all those elements you mentioned are in the optimum range (B6, B12, folic acid, iron, etc). This is because the kidneys produce a hormone called erythropoietin (EPO), which signals the bone marrow to produce red blood cells.