3.2 Time and frequency of investigation

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Within 3 days - CBC, Haematocrit, NS1 antigen, SGOT, SGPT

These tests should be done during first consultation to get the baseline characteristics like Haematocrit and Complete blood count if the patient presented within 3 days of fever. Follow up testing may be done on 1st afebrile day, but should be done daily once DHF is suspected. A regular haematocrit is more important for management than the thrombocytopenia. Even in severe dengue especially with shock) hourly haematocrit is crucial for management. Once the platelet count begins to rise and reaches ≥ 50,000/mm³, daily lab evaluations may be discontinued.

For clinical purpose, Complete blood count, NS1 antigen and SGOT (AST) and or SGPT (ALT) done within three days will confirm the diagnosis and guides for monitoring and management.