In the diagnosis of DHF, variables with high sensitivity, in decreasing order, were PC < 150 × 109 cells/L (100%), PC < 100 × 109 cells/L (100%), AST > 40 U/L (97.1%), PC < 150 × 109 cells/L + AST > 40 U/L (97.1%), PC < 100 × 109 cells/L + AST > 40 U/L (97.1%), ALT > 40 U/L + AST > 40 U/L (92.6%), PC < 150 × 109 cells/L + ALT > 40 U/L + AST > 40 U/L (92.6%), and PC < 100 × 109 cells/L + ALT > 40 U/L + AST > 40 U/L (92.6%). This evidence concerns the gene GPT and Dengue hemorrhagic fever.