Introduction: Renal transplantation is the treatment of choice for managing patients with end-stage kidney disease. Being submitted to a very serious surgical procedure, renal transplant recipients can only benefit from follow-up imaging and monitoring strategies. Duplex study is considered as the principal imaging test in the evaluation of renal transplants. Objective: To assess the doppler study of transplanted kidney follow up at CKD & Urology Hospital, Dhaka, Bangladesh. Materials and Methods: The Duplex study was conducted at Dept. of Radiology and Imaging, CKD & Urology Hospital, Dhaka, Bangladesh from January to April 2022. Fifty patients (36 males and 14 females) who underwent renal transplantation were included. Their ages ranging from 16-60 years; they all subjected to ultrasound, color Doppler and histopathology. All patients underwent clinical evaluation as well as biochemical and radiological examination in the post-transplant period. They were evaluated on gray scale and color Doppler as a protocol on the 5th, 14th and 30th post-operative day. They were also evaluated as and when clinical suspicion of graft dysfunction was raised. Results: A total of 50 renal transplant recipients were included in this study. Most number of patients, 12 (40%) were in the 30-39 years age group. There were 36 male and 14 female patients. 50 patients (100%) presented with a rise in serum creatinine. 4 patients (8%) presented with tenderness and swelling over transplanted kidney. 7 patients (14%) presented as uncontrolled hypertension. There were seven patients who developed chronic rejection (14%). Transplant renal artery stenosis was detected in 2 cases (4%). One case each of renal artery thrombosis (2%) were encountered. Peritransplant fluid collections were seen in 20 patients (40%). 2 patients (4%) developed post biopsy arterio-venous fistulas. 14 patients (28%) had small post op collections without any graft dysfunction. All of them showed regression on follow up ...