In a routine blood test, there are four key values that people look for: total white blood cells, total red blood cells, hemoglobin and platelets. If the white blood cells are high in the routine blood test, it is likely to be a bacterial infection; if the white blood cells are more than 50,000 or 60,000 and have abnormal morphology, it is possible that the person is suffering from leukemia; below 2,000 or below, it means that the resistance is low and often easy to catch cold and flu, and the cause should be further investigated; high red blood cells may be due to long-term lack of oxygen; low, it may be malnutrition or bone marrow anemia; platelets: platelets are the coagulation function Platelets: platelets are one of the important factors of blood clotting function, low platelets, there is a possibility of coagulation dysfunction; high, indicating blood concentration; platelets are extremely high, it is possible to suffer from platelet leukemia.