Routine blood tests can detect anemia, leukemia, infection, etc. Further tests are needed to clarify the situation. 1. Anemia: hemoglobin and red blood cell decrease are the most direct indicators of anemia, and the volume and distribution of red blood cells can show the type of anemia. 2. Leukemia: Lymphocytic leukemia and granulocytic leukemia are manifested by corresponding elevated lymphocytes and granulocytes, and bone marrow aspiration and genetic testing are required to confirm the diagnosis. 3. Infection: Elevated white blood cells are also considered to be related to infection. The percentage of neutrophils and lymphocytes can be used to determine whether the infection is bacterial or viral. In addition, there are many other diseases that can be manifested through blood tests. If you find any abnormalities in blood tests, please go to the hospital immediately, complete the relevant laboratory tests, identify the cause of the disease, and carry out professional treatment.