Routine blood tests can be measured at any time of the day and are not affected by factors such as eating, and do not necessarily have to be performed early in the morning on an empty stomach. Routine blood tests mainly include red blood cells, hemoglobin, white blood cells, platelets and other indicators. Routine blood tests are mainly used for the following: i. White blood cells and their classification. White blood cells are an important indicator of inflammatory response and are mainly used for auxiliary diagnosis and judgment of condition in inflammation. Abnormalities in the quality and quantity of white blood cells are also seen in various blood diseases, such as acute and chronic leukemia. Second, red blood cells and hemoglobin, mainly used for the examination of various anemia, as well as auxiliary for the identification of the cause of anemia. Third, platelets, platelets are important factors in the coagulation process, abnormalities in the quality and quantity of platelets can lead to coagulation dysfunction, platelets are mainly used in the examination of various bleeding disorders.