The routine blood tests include hemoglobin, platelets, white blood cells, and red blood cells.1 The white blood cells are used to find out if there is a bacterial infection, viral infection, or blood-borne disease.2 The red blood cells are used to find out if there is anemia after blood loss, or if there is an increase in red blood cells due to diarrhea or dehydration.3 The hemoglobin is used to find out if there is anemia. The lower the hemoglobin, the more serious the anemia. 4. Platelets are to understand whether there is acute leukemia, hypersplenism, and if the platelets are increased, it is seen in bleeding thrombocytosis, multiple myeloma and other diseases.