Platelet specific volume refers to the platelet pressure product. A platelet pressure product of 0.3% is not normal and may be due to diseases such as primary thrombocythemia, macrocytic anemia, chronic granulocytic leukemia, and true erythrocytosis. There are many clinical reasons for elevated platelet pressure product, mainly related to the absolute increase in platelet count and the increase in the mean volume of platelets. 1. If it is caused by an increase in the absolute value of platelet count, clinically it is mostly seen in diseases such as primary thrombocythemia. 2. If it is caused by an increase in the mean volume of platelets, it is mostly seen in diseases such as chronic granulocytic leukemia and true erythrocytosis. Platelet specific volume is the product of mean platelet volume and platelet count. Under normal circumstances, the reference range should be about 0.11% to 0.23%, so a platelet specific volume of 0.3% is abnormal and belongs to a high situation. Thrombocyte product may also be occasionally elevated without cause, and the disease cannot be judged from one result alone, but needs to be judged by a combination of other indicators. To summarize, patients with a platelet count of 0.3% need to complete other tests to clarify the specific cause and cooperate with doctors for active treatment.