Introduction:The diagnosis of Dengue fever is often delayed owing to time taken for availability of serology test results. Ultrasonography (USG) is a cheap, rapid and widely available non-invasive imaging method. Aim of the study was to access the role of ultrasonographic features of thorax and abdomen in diagnosis and early prediction of severity of dengue fever. Material and Method: It was aobservational descriptive study, conducted during the period of September 2017 to august 2018 at department of Paediatrics, J. K. Lon Mother and Child Hospital, Government Medical College, Kota. Out of 122 suspected dengue fever cases of age group 2 month to 18 years, 84 children were seropositive for dengue fever, were sent for Ultrasound scan of the abdomen and thorax. Result: 59(70.23%) cases were in mild dengue group and 25(29.76%) cases were in severe dengue group. All cases had fever. About 41(57.14%) cases had vomiting, 48(57.14%) had pain abdomen, 54 (64.28%) had Petechiae, 45 (53.57%) had melena. 38 (45.23%) had hepatomegaly, 21 (25%) had splenomegaly and 25 (29.76%) had hypotension. Gall bladder wall edema, ascites, pleural effusion, hepatomegaly, splenomegaly and perinephric edema were present in