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Dengue Hemorrhagic Fever was a health problem in Indonesia. Dengue Hemorrhagic Fever in West Kalimantan Province in 2017 the death rate was ranked second in Indonesia. The city of Pontianak as the center of West Kalimantan Province plays an important role in the spread of dengue disease, to the surrounding regencies/cities. Objectives: To analyze the sensitivity, specificity, positive predictive value and negative predictive value of the diagnostic tools used, namely; fever/heat, chills, headache, combination of fever and chills, combination of fever and headache, and combination of fever, chills and headache. Methods: The design in this study used an analytical observational design with a cross-sectional design. Results: The validity as measured by clinical symptoms was compared with the standard, namely a complete blood count, the results of clinical symptoms that had high sensitivity were obtained, namely a single clinical symptom of fever/heat, namely Se; 75.00%, Sp: 89.36%, PPV: 17.64% and NPV: 99.15%, while the combination symptoms that have the highest validity are fever/heat, headache, rash on the skin, and bleeding from the nose. and Guzi with the value of Se; 87.78%, Sp:92.96%, PPV: 41.18% and NPV: 99.18%. Develop an application. A simple diagnostic tool, a Wi-fi-based diagnostic tool that can be accessed with a cellphone and has succeeded in making a Flowchart of the Dengue Fever Suggestion: Combination of symptoms of fever, headache, skin rash, and bleeding from the nose and Guzi are typical symptoms found in the study area. [ABSTRACT FROM AUTHOR]