According to the World Health Organization (WHO), thrombocytopenia, which is defined as a rapid decline in the platelet count or a platelet count below 150,000/mm3 (<150 G/L), is considered a criterion to assess the severity of dengue fever. A platelet count of less than 100,000/μl is one of the diagnostic criteria for dengue hemorrhagic fever. However, not all dengue patients with low platelet counts need transfusions. Only about 5% of dengue patients face complications such as severe bleeding and require transfusions. The DHS guidelines stipulate that platelet transfusion should be given to patients with platelet count < 20,000/cumm. In general, the normal platelet count in a human body ranges from 1.5 to 4 lakh. In dengue, the platelet count can drastically fall below 1.5 lakh. Therefore, while a platelet count of less than 100,000/μl is one of the diagnostic criteria for dengue hemorrhagic fever, the need for platelet transfusion depends on the severity of the disease and the patients condition.