A mean platelet volume of 7.9 is generally normal and is within the normal range of values. The normal value of the average platelet volume generally needs to reach 7.8~11fl, so 7.9fl is normal. In addition, when doing routine blood tests, the normal reference value of average platelet volume will be clearly labeled on the test form, and if it exceeds the reference range, the platelet volume is generally low or high. Low platelet volume may be due to poor bone marrow proliferation, such as aplastic anemia, while high platelet volume can be seen in large platelet syndrome. If the index is abnormally high or low during the average platelet volume examination, it is best to combine other related examinations to further confirm the diagnosis, and then according to the examination results, do targeted treatment under the guidance of physicians.