1. Serology: Blood tests may show IgM antibodies. Antibody levels in acutely infected blood may increase up to fourfold. Dengue is diagnosed by detecting the presence of specific antibodies in the blood.
2. Platelet Test: The platelet count in the blood falls below 150,000/mm3. A basic idea about dengue is taken by blood cell count or platelet count.
3. Cell Culture: Blood is collected from an infected body. The virus can be detected by blood cell culture.