Objectives: Dengue fever may manifested without or with warning sign (DWOWS or DWS) and severe dengue (SD) (WHO 2009). DWOWS can be distinguished from DWS if there is plasma leakage that can be showed by changes in plasma (increased hematocrite) or detecting ascites or pleural effusion by USG. Standard abdominal ultra-sound examination (USG) could found plasma leakage, but this equipment is costly and impractical in daily use. In this study we examined the role of pocket USG device to detect plasma leakage as alternative to ordinary USG. Methodology: Dengue fever patients are included prospectively in HSH since March 2011 until March 2012, examined appropriately to confi rm and classify dengue disease. Pocket USG (P02742, 3.5 Mhz, Signos, Australia) was used to fi nd ascites, pleural efusion or thickened gallbladder wall (defi ned as wall thickness >0.35 cm). Examined bedside on hospitalized day 1, 3 and 5 for every patients. Analysis was conducted assessing contribution of this USG examination to detect of plasma leakage in comparison with increased hematocrite. Results: Sixty nine dengue patients were enrroled with characteritis as, fever median duration of 6-7 days, 31 male (45%) with a mean±SD age of 33±15 years. Hct increase (as indicator of plasma leakage) has detected in 22 (31.9 %) of the group. Pocket USG detected ascites in 12 (17.4%), pleural efusion 10 (14.5%). GBT in 22 (31.9%), and pericholecystic fl uid in 5 (7.2%) of the patients. Fluid accumulation mostly detect in median day of fever 6 (range 3-8) days. Overall, fl uid accumulation as plasma leakage was detected by USG in 27 (39.1%) where as hematocrite increased were found in 22 (31.9%) (p<0.05). GBT were compared to hematocrite for severe dengue (SD), (p<0.01, OR 64.50, 95% CI 9.54-436.20). In comparison with standard USG accuracy was reasonably well. Based on these, we can clasify dengue patient into 42 (60.9%) DWOWS, 22 (31.9%) DWS and 5 (7.2%) SD. Conclusion: Pocket USG allows detection of plasma leakage including GBT related to severity of dengue infection more sensitive than Hct. Because of its portability, it can be used bedside and in emergency room rapidly.