There is no fixed, standardized value for how low platelets are for leukemia. On the one hand, there are many causes of platelet reduction, and low platelets are not necessarily leukemia; on the other hand, the number of platelets varies in different stages of leukemia. You cannot judge whether you are suffering from leukemia simply based on the value of platelet decrease, but should combine with other test results to make a comprehensive judgment. Usually, mild platelet drop can be seen in the early stage of leukemia, and as more and more leukemia cells, i.e. tumor cells, the degree of platelet drop will be aggravated, and patients with leukemia not only have platelet drop, but also have anemia and white blood cell count change at the same time. If there are changes in the number of white blood cells, red blood cells and platelets at the same time, leukemia can be suspected at this time, but it cannot be diagnosed accordingly, and it is necessary to go to a regular hospital for comprehensive examination and comprehensive analysis and judgment. If the patient is diagnosed with leukemia, it has been diagnosed and should receive regular and active treatment immediately.