Routine blood test is the most basic blood test, through the routine blood test can check a lot of problems, routine blood test includes the following aspects: First, check the cell parameters, including the average level of red blood cells, red blood cell distribution density, hematocrit and so on. Second, check the white blood cell count, including the number of lymphocytes, the number of neutrophils and so on. Third, check the platelets, including the average volume of platelets, platelet pressure, etc. Fourth, check the hemoglobin, including hemoglobin, red blood cell content and average red blood cell hemoglobin concentration, etc. These tests can help the doctor to play a strong supporting role in diagnosis.