Adults have a red blood cell volume of 80-100 fL. If the red blood cell volume is 83.5 fL, it is considered to be within the normal range and not a big problem. Erythrocyte volume is the average volume of individual red blood cells and is one of the tests in the routine blood count. A low erythrocyte volume is usually indicative of shrinkage of red blood cells due to insufficient hemoglobin, and a high erythrocyte volume is usually indicative of impaired maturation of red blood cells. When the red blood cell volume is not in the normal range, it suggests that there may be an abnormality. However, it is important to take into account the patient’s hemoglobin level, red blood cell count, and the patient’s physical signs. In addition, abnormal red blood cell volume may also be caused by testing errors or physiological changes, so a single abnormal red blood cell volume has little clinical diagnostic significance.