Tests may include the following:
Hematocrit
Platelet count
Electrolytes
Coagulation studies
Liver enzymes
Blood gases
Tourniquet test (causes petechiae below the tourniquet)
X-ray of the chest (may demonstrate pleural effusion)
Serologic studies (demonstrate antibodies to Dengue viruses)
Serum studies from samples taken during acute illness and convalescence (increase in titer to Dengue antigen)
